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 0x3be16eb6b049aca0462efe8a452885c5ddf247a7369127f3ace1980ed1cace9c. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/86e76510-cc25-4a08-87a3-34d4b6ce54dc.json and https://artists.proofprofile.net/proofs/artist/86e76510-cc25-4a08-87a3-34d4b6ce54dc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Flute Quartet in A Major, K. 298: II. Minuetto - Trio
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 0x87f7e014b5716c7d5d776264eb6c2f1ac05bab468ded3aebd827df9a480645ae. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLY331903126 — a six-check JSON result.
Bach: 6 Suiten für Violoncello Solo / Suite für Violoncello und Klavier
In Flanders' Fields Vol. 60: A Tribute to Frits Celis
Almira, HWV 1, Suite (Ed. Holman): III. Bourrée
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd8841f2fabeb1bbea7035aeb3fcf8b956e9f13109d2bcc41ca1bfd886ba655. 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/GBAJY2240134 — a six-check JSON result.
Abdelazar, Z. 570, Suite: II. Rondeau. Hornpipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380d91a65b6087619b9b33dee53b6fc6f0d6594abc510644597ba60d6b52add3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAJY9260011 — a six-check JSON result.
Keyboard Sonata in D Minor, Kk. 64 "Gavota"
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Fantasia No. 1 for Solo Violin in B-Flat Major, TWV 40:14: III. Grave –
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Nouvelles suites de pièces de clavecin, Suite in A Minor, RCT 5: VIIe. Double 4
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Flute Sonata in B Minor, Op. 1 No. 9b, HWV 367b: VI. Alla breve
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e36c5b38a826b298a9382019ebb98901db9f34aeb38f047dbdb591cdce24c87. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBAJY9492331 — a six-check JSON result.
Fantasia No. 11 for Solo Violin in F Major, TWV 40:24: II. Soave –
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Sonata in C Minor, Op. 6 No. 10: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a488dc5dc38d1534308807bca0695e6d3740e4b4e287e26e67021a1c9b4ec9. 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/GBAJY9483127 — a six-check JSON result.
Violin Sonata No. 2 in B-Flat Major, Op. 5 No. 2: III. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b6920bea9559d481a10d40ff4f852e7354e11997b4ffd5b8a6727a146e11c9. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/GBAJY9038108 — a six-check JSON result.
Freie Fantasie fürs Clavier in F-Sharp Minor, H. 300: VIII. Adagio
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Violin Sonata in D Minor, RV 14: II. Corrente. Allegro
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Oboe Concerto in D Minor, TWV 51:d1: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc2c0018b95fb4cbaca79092604a28fc2596080b1f416ecf1d9e18a2e2bc243. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBAJY8826706 — a six-check JSON result.
Violin Sonata No. 1 in D Major, Op. 5 No. 1: V. Allegro
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Partita No. 2 in C Minor, BWV 826: V. Rondeau - Recorded 2018
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de9758120e4dec8e815245a0cbe18be8d45dd0f63bce0b5c813045517360a54. 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/GBAJY2238720 — a six-check JSON result.
Sonata in A Major, Op. 6 No. 11: III. Adagio
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Violin Sonata in D Minor, RV 14: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5b6623db722f56d4a69dd458d711368cdaf13a0b6876dc61ed24f891a265da. 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/GBAJY0446712 — a six-check JSON result.
2-Part Invention No. 1 in C Major, BWV 772
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Sonata in A Minor, Op. 6 No. 6: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2e069cb632af2215890cf04e758d2117e256bcc97efe3176f1a4306b7f25c1. 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/GBAJY9483236 — a six-check JSON result.
Nouvelles suites de pièces de clavecin, Suite in A Minor, RCT 5: VIId. Double 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185aef82c35891e52ef1fcd1a8ef6b1fad593dafb9ab92b57e2c38c025f05c35. 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/GBAJY0659727 — a six-check JSON result.
Premier livre de pièces de clavecin, Suite in A Minor, RCT 1: VII. Vénitienne
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Flute Sonata in B Minor, HWV 376 "Halle No. 3": III. Largo
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Fantasia in C Major, H. 291: I. Presto di molto
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Fantasia in C Major, H. 291: V. Presto di molto
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Nouvelles suites de pièces de clavecin, Suite in A Minor, RCT 5: VIIg. Double 6
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Concerto grosso No. 6 in E Major: III. Largo
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Violin Sonata No. 10 in F Major, Op. 5 No. 10: IV. Gavotta. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584fd2e17ec9036154645b903a695be4233836fd0e63f6c5e9cb00a0a136d8f2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBAJY9038216 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd373f12e07e72db27c77bca80f38cdcb6ec1d07d7c37f24cf444c89d7eb39131. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBAJY2238712 — a six-check JSON result.
Duet for Flute and Violin, H. 598: I. Andante
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Ottone in villa, RV 729: Sinfonia: c. Allegro
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3722a6a1913ffcac10b5e773931e6374d853da44e3565b34409ba07ddfd13527. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBAJY2238713 — a six-check JSON result.
Freie Fantasie fürs Clavier in F-Sharp Minor, H. 300: III. Largo
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Nouvelles suites de pièces de clavecin, Suite in A Minor, RCT 5: VIIb. Double 1
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Sonata in A Major, Op. 6 No. 11: I. Grave
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a45f4f636e3b259160bf569290f107734ac7c2cd6fa243904795ecb1caacf68. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBAJY2444808 — a six-check JSON result.
Violin Sonata No. 11 in E Major, Op. 5 No. 11: V. Gavotta. Allegro
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Premier livre de pièces de clavecin, Suite in A Minor, RCT 1: IX. Menuet
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Almira, HWV 1, Suite (Ed. Holman): IV. Menuet
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Freie Fantasie fürs Clavier in F-Sharp Minor, H. 300: IX. Allegretto
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Sonata in B-Flat Major, Op. 6 No. 3: I. Grave
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Violin Sonata in C Major, RV 1: II. Allemanda. Presto
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Sonata in B-Flat Major, Op. 6 No. 3: IV. Presto
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Almira, HWV 1, Suite (Ed. Holman): II. Courante
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Freie Fantasie fürs Clavier in F-Sharp Minor, H. 300: VI. Adagio
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Concerto for Strings in G Minor, RV 157: II. Largo
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Sonata in B Minor, Op. 4 No. 6: IV. Allegro
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Premier livre de pièces de clavecin, Suite in A Minor, RCT 1: VIII. Gavotte
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Ottone in villa, RV 729: Sinfonia: b. Larghetto
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Violin Sonata No. 6 in G Major, BWV 1019: II. Largo
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Violin Sonata in B Minor, RV 36: III. Giga. Presto
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Violin Sonata in D Minor, HWV 359a: III. Adagio
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Sonata for Keyboard and Violin in A Major, K. 12: II. Allegro
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Flute Sonata in B Minor, Op. 1 No. 9b, HWV 367b: V. Adagio
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Hungarian Dances, WoO 1 (Arr. Joachim for Violin & Piano): No. 21 in E Minor. Vivace
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Flute Quartet in A Major, K. 298: II. Menuetto
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Variations on a Rococo Theme, Op. 33 (Arr. Malzew for Cello, Piano & 4 Saxophones): Theme. Moderato semplice
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Serenade for String Trio in D Major, Op. 8: VI. Marcia. Allegro
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Oboe Sonata in C Minor, HWV 366: IV. Bourrée anglaise
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Hungarian Dances, WoO 1 (Arr. Joachim for Violin & Piano): No. 18 in D Major. Molto vivace
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Violin Sonata in C Major, RV 1: III. Giga. Allegro
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6 Épigraphes antiques, CD 139: VI. Pour remercier la pluie au matin
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Flute Sonata in D Major, HWV 378: III. Adagio
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Hungarian Dances, WoO 1 (Arr. Joachim for Violin & Piano): No. 9 in E Minor. Allegro non troppo
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Violin Sonata in G Major, BWV 1021: IV. Presto
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Flute Sonata in E Minor, HWV 375 "Halle No. 2": II. Allegro
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Sonata for Keyboard and Flute in A Major, K. 12: II. Allegro
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Nie ma czego trzeba, Op. 74 No. 13 (Arr. Isserlis for Cello and Piano)
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6 Épigraphes antiques, CD 139: IV. Pour la danseuse aux crotales
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Flute Sonata in G Major, Op. 1 No. 5, HWV 363b: V. Menuet
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3 Equali for 4 Trombones, WoO 30: No. 3, Poco sostenuto
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Flute Sonata in B Minor, Op. 1 No. 9b, HWV 367b: VII. A tempo di minuet
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3 Equali for 4 Trombones, WoO 30: No. 2, Poco adagio
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Violin Sonata in E Minor, BWV 1023: I. Prelude. [Allegro]
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Flute Sonata in E Minor, HWV 375 "Halle No. 2": I. Adagio
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7 Bagatelles, Op. 33: No. 3 in F Major. Allegretto
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24 Preludes, Op. 28: No. 3 in G Major. Vivace
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Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": III. Rondo. Allegretto
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16 German Dances, D. 783: No. 3 in B-Flat Major
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Papillons, Op. 2: No. 9 in B-Flat Minor. Prestissimo
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Flute Sonata in C Major, BWV 1033: I. Andante
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Serenade in C Major, K. 648 "A Very Little Night Music" (Original Version for 2 Violins & Bass): I. Marche - World Premiere Recording
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Serenade in C Major, K. 648 "A Very Little Night Music" (Original Version for 2 Violins & Bass): II. Allegro - World Premiere Recording
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Serenade in C Major, K. 648 "A Very Little Night Music" (Original Version for 2 Violins & Bass): III. Menuet [I] – Trio - World Premiere Recording
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Serenade in C Major, K. 648 "A Very Little Night Music" (Original Version for 2 Violins & Bass): IV. Polonoise "Boloneso" - World Premiere Recording
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Serenade in C Major, K. 648 "A Very Little Night Music" (Original Version for 2 Violins & Bass): V. Adagio - World Premiere Recording
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Violin Sonata in A Minor "Sonatina", D. 385: III. Menuetto. Allegro
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Hungarian Dances, WoO 1 (Arr. Joachim for Violin & Piano): No. 19 in A Minor. Allegretto
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Flute Sonata in E Minor, H. 551: II. Allegro
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Sonata for Solo Flute in A Minor, H. 562: I. Poco adagio
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