1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7416a8b0d7a61c64b3b3d768013122b710a256b85f8c8bb6dcee67f0fa8251d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4eaf5239-917f-498d-b262-3a60beff1768.json and https://artists.proofprofile.net/proofs/artist/4eaf5239-917f-498d-b262-3a60beff1768.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Piano Concerto No. 5 in E-flat Major, Op. 73, "emperor": Piano Concerto No. 5 in E-flat Major, Op. 73, "emperor"
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f848ae64ac640416682d4ff8280a48fd96a73cb37241e9804c63bd187193af9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199213605 — a six-check JSON result.
String Quartet No. 13 in B-flat Major, Op. 130: V. Cavatina: Adagio molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25892b1961332c2162c2d85e49ecaa62bd549cf8bd5063d0a980a97fa83d67b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199935905 — a six-check JSON result.
Piano Trio No. 1 in E-flat Major, Op. 1, No. 1: Ii. Adagio cantabile
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Symphony No. 6 in F Major, Op. 68, "pastoral": Ii. Scene by the brook: Andante molto mosso
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Piano Sonata No. 8 in C Minor, Op. 13, "pathétique": Ii. Adagio cantabile
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String Quartet No. 5 in A Major, Op. 18, No. 5: Iii. Andante cantabile - Poco adagio
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Violin Sonata No. 10 in G Major, Op. 96: Ii. Adagio espressivo
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Piano Sonata No. 23 in F Minor, Op. 57, "appassionata": Ii. Andante con moto
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Cello Sonata No. 3 in A Major, Op. 69: Iii. Adagio cantabile
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Piano Concerto No. 3 in C Minor, Op. 37: Ii. Largo
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Septet in E-flat Major, Op. 20: Ii. Adagio cantabile
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Piano Sonata No. 14 in C-sharp Minor, Op. 27, No. 2, "moonlight": I. Adagio sostenuto
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Romance No. 2 in F Major, Op. 50: Romance No. 2 in F Major, Op. 50
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Piano Concerto No. 23 in A Major, K. 488: II. Adagio
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Serenade No. 12 in C Minor, K. 388: II. Andante
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Symphony No. 28 in C Major, K. 200: II. Andante
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Concerto for Flute & Harp in C Major, K. 299: II. Andantino (Excerpt)
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String Quartet No. 21 in D Major, K. 575, "prussian No. 1": Ii. Andante
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Piano Sonata No. 5 in G Major, K. 283: Ii. Andante
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Piano Concerto No. 5 in E-flat Major, Op. 73, "emperor": Ii. Adagio un poco moto
String Quartet No. 13 in B-flat Major, Op. 130: V. Cavatina, Adagio molto espressivo
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Violin Sonata No. 5 in F Major, Op. 24, "spring": Ii. Adagio molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5512613c47021052ebe88ea9e4de14434bf44029e3e6a5a6823f9a305ab19fb9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199217802 — a six-check JSON result.
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Mozart: Clarinet Quintet, K. 581 / String Quintet, K. 515
Clarinet Quintet in A Major, K. 581: I. Allegro
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Clarinet Quintet in A Major, K. 581: II. Larghetto
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Le nozze di Figaro (The Marriage of Figaro), K. 492: Overture
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Concerto for Flute and Harp in C Major, K. 299: II. Andantino (excerpt)
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Piano Sonata No. 16 in C Major, K. 545: I. Allegro
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Horn Concerto No. 4 in E-Flat Major, K. 495: III. Rondo: Allegro vivace
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The A to Z of Classical Music (3rd Expanded Edition, 2009)
A Guided Tour of the Classical Era, Vol. 2
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
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Bagatelle in A Minor, WoO 59, "Fur Elise"
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Septet in E-Flat Major, Op. 20: II. Adagio cantabile
Concerto for Violin, Cello & Piano in C Major, Op. 56 "Triple Concerto": II. Largo
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Piano Trio in B-Flat Major, Op. 11 "Gassenhauer": II. Adagio
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Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio cantabile
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Violin Concerto in D Major, Op. 61: II. Larghetto
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Cello Sonata No. 3 in A Major, Op. 69: III. Adagio cantabile
Violin Sonata No. 5 in F Major, Op. 24 "Spring": II. Adagio molto espressivo
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Quintet in E-Flat Major, Op. 16: II. Andante cantabile
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Symphony No. 6 in F Major, Op. 68 "Pastoral": II. Scene by the brook: Andante molto mosso
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Violin Sonata No. 5 in F Major, Op. 24, "spring": Violin Sonata No. 5 in F Major, Op. 24, "spring"
Piano Sonata in E-flat Major, Woo 47, No. 1, "kurfürstensonaten": Ii. Andante
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Violinromanze Nr. 2 F-Dur, Op. 50: Violin Romance No. 2 in F Major, Op. 50
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Piano Quintet in E-Flat Major, Op. 16: Piano and Wnd Quintet in E-Flat Major, Op. 16: Andante cantabile
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Serenade No. 13 in G Major, K. 525, "Eine kleine Nachtmusik": II. Romanze: Andante
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Kinderszenen (Scenes of childhood), Op. 15: VII. Träumerei (Dreaming) (arr. for orchestra)
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Frösöblomster, Book 1, Op. 16: Frosoblomster (Froso-Flowers), Book 1, Op. 16: No. 6. Vid Froso kyrka (At Froso Church)
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Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (arr. D. Sosin for flute and harp)
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Fredmans epistlar (arr. J. Eriksson): Fredmans epistlar: No. 82. Vila vid denna kalla (arr. for orchestra)
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Consort Music: Consort Music: III. Ballad
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Pavane pour une infante defunte (version for piano)
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Clarinet Concerto in A Major, K. 622: II. Adagio
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Nocturnes, Op. 9: Nocturne No. 2 in E-Flat Major, Op. 9, No. 2
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Suite del recuerdo: Suite del recuerdo: I. Evocacion
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Cello Concerto No. 1 in G Major: II. Romance: Andantino
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En vintersaga, Op. 18: En vintersaga (The Winter's Tale), Op. 18: IV. Epilogue
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Beatles Concerto Grosso No. 3: II. Eight Days a Week: Rondeau (in the style of J.S. Bach)
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Beatles Concerto Grosso No. 4: III. Goodnight
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27, No. 2, "Moonlight": I. Adagio sostenuto
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Gustav Adolf II, Op. 49: Gustav II Adolf, Op. 49: VII. Elegy
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Gammal fabodpsalm fran Dalarna (Old Pastoral Hymn from Dalecarlia) (arr. J. Johansson for orchestra): 2 Sentimental Romances, Op. 28: No. 1. Gammal fabodpsalm fran Dalarna (Old Pastoral Hymn
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Saeterjentens Sondag, "The Herd-girls' Sunday"
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3 Gymnopédies (arr. for flute and harp): Gymnopedie No. 3 (arr. for flute and harp)
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Stardust (arr. L. Kallin): Stardust (trans. L. Kallin)
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Sången, Op. 44: Sangen, Op. 44: Interlude
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Donizetti: Double Concerto / Flute Concertino / Clarinet Concertino
Sinfonia a soli instrumenti di fiato in G Minor: Andante (recon. B. Pauler)
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Flute Sonata (Concertino) in C Minor: Largo - Allegro (orch. W. Hoffmann)
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Oboe Sonata in F Major (arr. W. Hoffmann): I. Andante
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Oboe Sonata in F Major (arr. W. Hoffmann): II. Allegro
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Concerto for Violin and Cello in D Minor (recon. J. Wojciechowski): I. Allegro ma non troppo
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Concerto for Violin and Cello in D Minor (recon. J. Wojciechowski): II. Andante
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Concerto for Violin and Cello in D Minor (recon. J. Wojciechowski): III. Rondo (Allegro moderato)
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Cor Anglais Concertino in G Major: Andante con variazioni
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Clarinet Concerto in B-Flat Major (reconstructed R. Meylan): I. Andante sostenuto
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Clarinet Concerto in B-Flat Major (reconstructed R. Meylan): II. Allegretto
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Liebesleid - Classical Favourites for Relaxing and Dreaming
Gardonyi: Suite No. 1 in Old Style / Maros: Albumblatter / Kazacsay: Divertimento / Farkas: 4 Pezzi
Brahms: Clarinet Quintet in B Minor / Dvorak: String Quartet No. 12, "American"
String Quartet No. 12 in F Major, Op. 96, B. 179, "American": III. Molto vivace
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Brahms: Clarinet Trio, Op. 114 / Clarinet Quintet, Op. 115
Beethoven: Chamber Music for Horns, Winds and Strings
Septet in E-Flat Major, Op. 20: I. Adagio - Allegro on brio
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Septet in E-Flat Major, Op. 20: III. Tempo di menuetto
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Septet in E-Flat Major, Op. 20: IV. Tema con variazioni: Andante
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Septet in E-Flat Major, Op. 20: V. Scherzo: Allegro molto e vivace
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Septet in E-Flat Major, Op. 20: VI. Andante con moto alla marcia - Presto
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Wind Quintet in E-Flat Major, Hess 19: I. Allegro
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Wind Quintet in E-Flat Major, Hess 19: II. Adagio maestoso
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Wind Quintet in E-Flat Major, Hess 19: III. Minuetto
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Sextet in E-Flat Major, Op. 81b: I. Allegro con brio
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Sextet in E-Flat Major, Op. 81b: II. Adagio
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Sextet in E-Flat Major, Op. 81b: III. Rondo
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String Quartet No. 32 in C Major, Op. 33, No. 3, Hob.III:39, "The Bird": I. Allegro moderato
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Flute Quartet No. 1 in D Major, K. 285: I. Allegro
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String Quartet No. 9 in C Major, Op. 59, No. 3, "Rasumovsky": I. Introduzione: Andante con moto - Allegro vivace
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Piano Trio No. 5 in D Major, Op. 70, No. 1, "Ghost": I. Allegro vivace e con brio
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Piano Quintet in A Major, Op. 114, D. 667, "Die Forelle" (The Trout): I. Allegro vivace
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String Quartet No. 32 in C Major, Op. 33, No. 3, Hob.III:39, "The Bird": II. Scherzo: Allegretto
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Flute Quartet No. 1 in D Major, K. 285: II. Adagio
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String Quartet No. 9 in C Major, Op. 59, No. 3, "Rasumovsky": II. Andante con moto quasi allegretto
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Piano Trio No. 5 in D Major, Op. 70, No. 1, "Ghost": II. Largo assai ed espressivo
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Piano Quintet in A Major, Op. 114, D. 667, "Die Forelle" (The Trout): II. Andante
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String Quartet No. 32 in C Major, Op. 33, No. 3, Hob.III:39, "The Bird": III. Adagio ma non troppo
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Flute Quartet No. 1 in D Major, K. 285: III. Rondo
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String Quartet No. 9 in C Major, Op. 59, No. 3, "Rasumovsky": III. Menuetto: Grazioso
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Piano Trio No. 5 in D Major, Op. 70, No. 1, "Ghost": III. Presto
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Piano Quintet in A Major, Op. 114, D. 667, "Die Forelle" (The Trout): III. Scherzo: Presto
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String Quartet No. 32 in C Major, Op. 33, No. 3, Hob.III:39, "The Bird": IV. Rondo: Presto
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String Quartet No. 14 in G Major, K. 387*: I. Allegro vivace assai
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String Quartet No. 9 in C Major, Op. 59, No. 3, "Rasumovsky": IV. Allegro molto
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Piano Trio No. 7 in B-Flat Major, Op. 97, "Archduke": I. Allegro Moderato
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Piano Quintet in A Major, Op. 114, D. 667, "Die Forelle" (The Trout): IV. Thema with Variations: Andante
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String Quartet No. 53 in D Major, Op. 64, No. 5, Hob.III:63, "The Lark": I. Allegro moderato
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String Quartet No. 14 in G Major, K. 387*: II. Menuetto: Allegro (Allegretto)
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String Quartet No. 14 in C-Sharp Minor, Op. 131: I. Adagio ma non troppo e molto espressivo
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Piano Trio No. 7 in B-Flat Major, Op. 97, "Archduke": II. Scherzo: Allegro
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Piano Quintet in A Major, Op. 114, D. 667, "Die Forelle" (The Trout): V. Finale: Allegro giusto
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String Quartet No. 53 in D Major, Op. 64, No. 5, Hob.III:63, "The Lark": II. Adagio - Cantabile
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String Quartet No. 14 in G Major, K. 387*: III. Andante cantabile
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String Quartet No. 14 in C-Sharp Minor, Op. 131: II. Allegro molto vivace
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Piano Trio No. 7 in B-Flat Major, Op. 97, "Archduke": III. Andante cantabile ma pero con moto
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String Octet in E-Flat Major, Op. 20, MWV R20: I. Allegro moderato, ma con fuoco
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String Quartet No. 53 in D Major, Op. 64, No. 5, Hob.III:63, "The Lark": III. Menuetto: Allegretto
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String Quartet No. 14 in G Major, K. 387*: IV. Molto allegro
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String Quartet No. 14 in C-Sharp Minor, Op. 131: III. Allegro moderato
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Piano Trio No. 7 in B-Flat Major, Op. 97, "Archduke": IV. Allegro moderato
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String Quartet No. 53 in D Major, Op. 64, No. 5, Hob.III:63, "The Lark": IV. Finale: Vivace
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String Quintet No. 4 in G Minor, K. 516*: I. Allegro
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String Quartet No. 14 in C-Sharp Minor, Op. 131: IV. Andante ma non troppo e molto cantabile
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String Quartet No. 62 in C Major, Op. 76, No. 3, Hob.III:77, "Emperor": I. Allegro
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String Quintet No. 4 in G Minor, K. 516*: II. Menuetto
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String Quartet No. 14 in C-Sharp Minor, Op. 131: V. Presto
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String Quartet No. 62 in C Major, Op. 76, No. 3, Hob.III:77, "Emperor": II. Poco adagio, cantabile
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String Quintet No. 4 in G Minor, K. 516*: III. Adagio ma non troppo
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String Quartet No. 14 in C-Sharp Minor, Op. 131: VI. Adagio quasi un poco andante
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String Quartet No. 62 in C Major, Op. 76, No. 3, Hob.III:77, "Emperor": III. Menuetto
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String Quintet No. 4 in G Minor, K. 516*: IV. Adagio - Allegro
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String Quartet No. 14 in C-Sharp Minor, Op. 131: VII. Allegro
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String Quartet No. 62 in C Major, Op. 76, No. 3, Hob.III:77, "Emperor": IV. Finale: Presto
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Keyboard Trio No. 25 in G Major, Hob.XV:25, "Gypsy Rondo": I. Andante
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Keyboard Trio No. 25 in G Major, Hob.XV:25, "Gypsy Rondo": II. Poco adagio
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Keyboard Trio No. 25 in G Major, Hob.XV:25, "Gypsy Rondo": III. Rondo all'Ongarese: Presto
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea75054f002c81d7489263ceb539254bf338d8b982d569cacaa2d3d66d079a8b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199274101 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9437e73358b7d54a6f5cd12b170d4b783888ab4dd93f0588c54071f290a898. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199274102 — a six-check JSON result.
Clarinet Quintet in A Major, K. 581: III. Menuetto
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Clarinet Quintet in A Major, K. 581: IV. Allegretto con Variation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41327bdcb72c3e7c4bf232ef69e5d131070e53d88bd8356aaef10b3cf56d66bf. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199274104 — a six-check JSON result.
Violin Sonata No. 28 in E-Flat Major, K. 380 (arr. J. Andre): I. Allegro maestoso
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Violin Sonata No. 28 in E-Flat Major, K. 380 (arr. J. Andre): II. Andante con moto
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Violin Sonata No. 28 in E-Flat Major, K. 380 (arr. J. Andre): III. Rondo: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73a6517ee0503af72d66c2f1ed6a5560ef4a311218014a976776fea4a839cbc. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199274107 — a six-check JSON result.
Clarinet Quintet in F Major, K. Anh. 90: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234a05c7e585f24572ddfca4d62ed12deeefff3e6a0ae2bfbdbe46c928f8be99. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199274108 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf26997b99a61bb2b0874d8799bda677953c9ba431528cfacb74172730e89054. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA251020809 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564df95b63152f9593d09ec1bc29ea9b776cd23f2b98c3d852dc70a6bd2f7ff0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA251020812 — a six-check JSON result.
Concert Csardas in B Minor (Waving, Swaying Read)
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String Quintet in E Major, Op. 11 No. 5, G. 275: III. Minuetto
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Holberg Suite, Op. 40: III. Gavotte (Version for Orchestra)
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Cello Sonata in G Minor, Op. 19: III. Andante
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2 Mélodies, Op. 3: No. 1 in F Major, Moderato assai (Arr. for Saxophone & Piano)
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4 Romantic Pieces, Op. 75, B. 150: No. 1, Allegro moderato (Arr. for Saxophone & Piano)
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The Gadfly Suite, Op. 97a: VIII. Romance (Arr. for Saxophone & Piano)
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Nicole's Theme (From "Tender Is the Night") [Arr. for Saxophone & Piano]
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Rosemary's Waltz (From "Tender Is the Night") [Arr. for Saxophone & Piano]
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La vie en rose (Arr. for Saxophone & Piano)
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Purple Classics Presents: Quiet Time – The Music of Mozart
Horen - Lernen - Wachsen: Music for Babies and Children
String Quintet in E Major, Op. 11, No. 5, G. 275: III. Minuetto (arr. for orchestra): Minuet
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Divertimento in B-Flat Major, K. 287: V. Menuetto
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Rom sam ame ! Traditional Gypsy Music from Hungary
Sarabande - Classical Favourites for Relaxing and Dreaming