thumb|Weithaas, Helmchen, Hecker in 2019 Martin Helmchen (born 1982) is a German pianist. He has played with international orchestras and has recorded discs of many classical composers. Life Helmche
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 0xcdb88c7219d6e3e56b98facd66f57aec578c5171840df172fbbefba2df4776c5. 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/cc1df412-f63c-4b55-895c-0afc2cf09852.json and https://artists.proofprofile.net/proofs/artist/cc1df412-f63c-4b55-895c-0afc2cf09852.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sharon Kam Portrait - Virtuose Klarinettenmusik
Recherchen - Vom Suchen und Finden der Musik
Haydn, Rossini & Schubert: Duo, Trio & Quartet
Der Tod und das Mädchen, Op. 7 No. 3, D. 531 (Arr. X. van Dijk for String Quartet)
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 0x685e5ed7aaf893a4ac7e257adc1f66bc1e025a5d5c0c8a7c28320efe30494868. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422006601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fea185ee7ab6357beaedba0d065ddc5eed2a22c69ffc79eeb3b810a5512f757. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421801313.
Piano Quintet in A Major, Op. 114, D. 667 "Die Forelle": II. Andante
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Violin Sonata in A Minor, Op. 137 No. 2, D. 385: II. Andante
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String Quintet in C Major, Op. 163, D. 956: IV. Allegretto - Più allegro
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Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: III. Scherzando. Allegro moderato
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Winterreise, Op. 89, D. 911 (Excerpts): No. 20, Der Wegweiser
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Symphony No. 2 in B-Flat Major, D. 125: II. Andante
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Du bist die Ruh, Op. 59 No. 3, D. 776 (Arr. X. van Dijk for String Quartet)
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Piano Sonata in B-Flat Major, D. 960: III. Scherzo. Allegro vivace con delicatezza
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Violin Sonata in D Major, Op. 137 No. 1, D. 384: II. Andante
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Piano Sonata in C Minor, D. 958: III. Menuetto. Allegro
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Erlkönig, Op. 1, D. 328 (Arr. M. Reger for Voice & Orchestra)
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Dvořák: Piano Concerto and New World Symphony
Piano Concerto in G Minor, Op. 33: I. Allegro agitato
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Piano Concerto in G Minor, Op. 33: II. Andante sostenuto
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Piano Concerto in G Minor, Op. 33: III. Finale: Allegro con fuoco
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Symphony No. 9 in E Minor, Op. 95, From the New World: I. Adagio – Allegro molto
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Symphony No. 9 in E Minor, Op. 95, From the New World: II. Largo
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Symphony No. 9 in E Minor, Op. 95, From the New World: III. Scherzo: Molto vivace
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Symphony No. 9 in E Minor, Op. 95, From the New World: IV. Allegro con fuoco
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Cello Concerto in E Minor, Op. 85: I. Adagio - Moderato
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Cello Concerto in E Minor, Op. 85: II. Lento - Allegro molto
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Cello Concerto in E Minor, Op. 85: III. Adagio
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Cello Concerto in E Minor, Op. 85: IV. Allegro - Moderato - Allegro, ma non troppo - Pocco più lento - Adagio
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Piano Quintet in A Minor, Op. 84: I. Moderato - Allegro
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Piano Quintet in A Minor, Op. 84: II. Adagio
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Piano Quintet in A Minor, Op. 84: III. Andante - Allegro
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Beethoven: Piano concerto 3 - Triple Concerto
Piano Concerto No.3 in C Minor, Op.37: I. Allegro con brio
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Piano concerto No. 1 in C Major, Op. 15: I. Allegro con brio
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Piano concerto No. 1 in C Major, Op. 15: II. Largo
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Piano concerto No. 1 in C Major, Op. 15: III. Rondo. Allegro
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Piano Concerto No. 4 in G Major, Op. 58: I. Allegro moderato
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Piano Concerto No. 4 in G Major, Op. 58: II. Andante con moto
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Piano Concerto No. 4 in G Major, Op. 58: Rondo. Vivace
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Beethoven: Piano Concertos 2 & 5 "Emperor"
Piano Concerto No.2 in B Flat-Major, Op. 19: I. Allegro con brio
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Piano Concerto No.2 in B Flat-Major, Op. 19: III. Rondo. Molto allegro
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Piano Concerto No.5 in E Flat-Major, Op. 73 "Emperor": I. Allegro
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Piano Concerto No.5 in E Flat-Major, Op. 73 "Emperor": II. Adagio un poco moto
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Piano Concerto No.5 in E-Flat Major, Op. 73 "Emperor": III. Rondo. Allegro
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Piano Concerto No. 1 in G Minor, Op. 25: I. Molto allegro con fuoco
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Piano Concerto No. 1 in G Minor, Op. 25: II. Andante
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Piano Concerto No. 1 in G Minor, Op. 25: III. Presto
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Piano Concerto No. 2 in D Minor, Op. 40, MWV O11: II. Adagio Molto sostenuto
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Schubert: Schwanengesang & String Quintet
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String Quintet in C Major, D. 956: I. Allegro ma non troppo
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Schwanengesang, D. 957: No. 6, In der ferne
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String Quintet in C Major, D. 956: II. Adagio
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Schwanengesang, D. 957: No. 4, Ständchen
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String Quintet in C Major, D. 956: III. Scherzo. Presto - Trio. Andante sostenuto
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Schwanengesang, D. 957: No. 3, Frühlingssehnsucht
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String Quintet in C Major, D. 956: IV. Allegretto - Più allegro
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Schwanengesang, D. 957: No. 3, Kriegers Ahnung
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Schwanengesang, D. 957: No. 1, Liebesbotschaft
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Schwanengesang, D. 957: No. 5, Aufenthalt
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Lieder ohne Worte, Op. 30: No. 3, Adagio non troppo
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Schwanengesang, D. 957: No. 10, Das Fischermädchen
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Schwanengesang, D. 957: No. 11, Die Stadt
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Schwanengesang, D. 957: No. 13, Der Doppelgänger
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Schwanengesang, D. 957: No. 8, Der Atlas
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Songs Without Words, Book 2, Op. 30: No. 6 in F-Sharp Minor, MWV U 110 "Venetianisches Gondellied"
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Pictures at an Exhibition: Promenade III
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Pavane pour une infante défunte, M. 19 (Version for Orchestra)
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7 Fantasien, Op. 116: No. 4 in E Major, Intermezzo
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Violin Concerto No. 3 in G Major, K. 216: II. Adagio
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Piano Sonata No. 25 in G Major, Op. 79: II. Andante
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Piano Concerto No. 1 in G Minor, Op. 25, MWV O 7: II. Andante
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Symphonic Metamorphosis After Themes by Carl Maria von Weber: III. Andantino
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Waldszenen, Op. 82: No. 3, Einsame Blumen
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Piano Sonata No. 31 in A-Flat Major, Op. 110: III. Adagio ma non troppo. Arioso dolente
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Wandrers Nachtlied, Op. 96 No. 3, D. 768 (Arr. X. van Dijk for String Quartet)
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Abendstern, D. 806 (Arr. X. van Dijk for String Quartet)
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String Quartet No. 16 in F Major, Op. 135: III. Lento assai, cantante e tranquillo (Arr. M. Mussorgsky for Piano)
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Violin Sonata No. 8 in G Major, Op. 30 No. 3: I. Allegro assai
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Violin Sonata No. 8 in G Major, Op. 30 No. 3: II. Tempo di minuetto, ma molto moderato e grazioso
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Violin Sonata No. 8 in G Major, Op. 30 No. 3: III. Allegro vivace
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Violin Sonata No. 9 in A Major, Op. 47 "Kreutzer": I. Adagio sostenuto - Presto
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Violin Sonata No. 9 in A Major, Op. 47 "Kreutzer": IIa. Andante con variazioni
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Violin Sonata No. 10 in G Major, Op. 96: II. Adagio espressivo
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Violin Sonata No. 5 in F Major, Op. 24 "Spring": I. Allegro
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Violin Sonata No. 5 in F Major, Op. 24 "Spring": II. Adagio molto espressivo
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Violin Sonata No. 6 in A Major, Op. 30 No. 1 "Spring": I. Allegro
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Violin Sonata No. 7 in C Minor, Op. 30 No. 2 "Eroica": I. Allegro con brio
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Violin Sonata No. 7 in C Minor, Op. 30 No. 2 "Eroica": II. Adagio cantabile
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Violin Sonata No. 7 in C Minor, Op. 30 No. 2 "Eroica": IV. Finale. Allegro - Presto
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Violin Sonata No. 1 in D Major, Op. 12 No. 1: I. Allegro con brio
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Andante cantabile (Arr. for Cello and Orchestra from String Quartet No. 1 in D Major, Op. 11)
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The Carnival of the Animals, R. 125: XIII. Le cygne (Arr. for Cello & 2 Pianos)
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Cello Sonata in G Minor, Op 19: III. Andante
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Adagio for Cello and Orchestra in G Major, Op. 38
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Arabesque No. 1, L. 66, No. 1 (Arr. for Cello and Piano)
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Violin Sonata in A Major, FWV 8 (Arr. for Cello and Piano): IV. Allegretto poco mosso
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Porgy and Bess: Summertime (Arr. for Cello and Piano)
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Thaïs: Méditation (Arr. for Cello and Piano)
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Cello Sonata No. 2 in F Major, Op. 99: IV. Allegro molto
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Lasst mich allein, Op. 82, No. 1 (Arr. for Cello and Piano)
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Fantasiestücke, Op. 73: I. Zart und mit Ausdruck
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Schubert: Arpeggione Sonata & Trio No. 2
Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: II. Andante con moto
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Arpeggione Sonata, D. 821: I. Allegro moderato in A Minor
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Arpeggione Sonata, D. 821: II. Adagio in E Major
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Arpeggione Sonata, D. 821: III. Allegretto in A Major
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Schubert: Piano Quintet & Variations on "Trockne Blumen"
Piano Quintet in A Major, Op. 114, D. 667 "Die Forelle": I. Allegro vivace
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Piano Quintet in A Major, Op. 114, D. 667 "Die Forelle": III. Scherzo - Presto
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Piano Quintet in A Major, Op. 114, D. 667 "Die Forelle": IV. Thema - Andantino - Variazione
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Piano Quintet in A Major, Op. 114, D. 667 "Die Forelle": V. Allegro giusto
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Variations on Trockne Blumen for Flute and Piano, Op. 160, D. 802: Introduction. Andante
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Variations on Trockne Blumen for Flute and Piano, Op. 160, D. 802: Thema. Andantino
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Variations on Trockne Blumen for Flute and Piano, Op. 160, D. 802: Variation II
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Variations on Trockne Blumen for Flute and Piano, Op. 160, D. 802: Variation III
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Piano Trio in E-Flat Major, Op. 148, D. 897 "Notturno"
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Davidsbündlertänze, Op. 6: No. 18, Nicht schnell
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Etudes symphoniques, Op. 13: Anhang Variation 4
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Partita No. 2 in C Minor, BWV 826: I. Sinfonia
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Partita No. 1 in B-Flat Major, BWV 825: I. Prelude
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Partita No. 2 in C Minor, BWV 826: II. Allemande
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Partita No. 1 in B-Flat Major, BWV 825: II. Allemande
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Partita No. 1 in B-Flat Major, BWV 825: III. Courante
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Partita No. 1 in B-Flat Major, BWV 825: IV. Sarabande
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Partita No. 1 in B-Flat Major, BWV 825: V. Menuett I & II
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Partita No. 1 in B-Flat Major, BWV 825: VI. Gigue
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Partita No. 3 in A Minor, BWV 827: I. Fantasia
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Partita No. 3 in A Minor, BWV 827: II. Allemande
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Partita No. 3 in A Minor, BWV 827: III. Courante
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Partita No. 3 in A Minor, BWV 827: IV. Sarabande
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Partita No. 3 in A Minor, BWV 827: V. Burlesca
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Partita No. 3 in A Minor, BWV 827: VI. Scherzo
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Partita No. 3 in A Minor, BWV 827: VII. Gigue
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Partita No. 4 in D Major, BWV 828: I. Ouverture
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Schumann: Novelleten & Gesänge der Frühe
Novelletten, Op. 21: I. Markiert und kräftig
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Messiaen: Vingt Regards sur l'Enfant-Jésus
Vingt regards sur l'Enfant-Jésus: I. Regard du Père
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Piano Concerto No. 15 in B-Flat Major, K. 450: III. Allegro
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Piano Concerto No. 27 in B-Flat Major, K. 595: II. Larghetto
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Piano Concerto No. 27 in B-Flat Major, K. 595: III. Rondo. Allegro
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Robert Schumann: Waldszenen, Symphonische Etüden & Arabeske
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Waldszenen, Op. 82: No. 2, Jäger auf der Lauer
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Waldszenen, Op. 82: No. 4, Verrufene Stelle
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Waldszenen, Op. 82: No. 5, Freundliche Landschaft
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Waldszenen, Op. 82: No. 7, Vogel als Prophet
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Etudes symphoniques, Op. 13: Thema. Andante
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Etudes symphoniques, Op. 13: Variation 1
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Etudes symphoniques, Op. 13: Variation 2
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Etudes symphoniques, Op. 13: Anhang Variation 1
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Etudes symphoniques, Op. 13: Variation 3
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Etudes symphoniques, Op. 13: Variation 4
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Etudes symphoniques, Op. 13: Variation 5
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Etudes symphoniques, Op. 13: Anhang Variation 2
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Etudes symphoniques, Op. 13: Anhang Variation 3
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Etudes symphoniques, Op. 13: Variation 6
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Etudes symphoniques, Op. 13: Anhang Variation 5
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Etudes symphoniques, Op. 13: Variation 7
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Etudes symphoniques, Op. 13: Variation 8
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Etudes symphoniques, Op. 13: Variation 9
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Symphony No. 2 in A Minor, Op. 55: I. Allegro marcato
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Symphony No. 2 in A Minor, Op. 55: II. Adagio
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Symphony No. 2 in A Minor, Op. 55: IV. Prestissimo
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Shostakovich: Piano Concerti & Piano Quintet
Schubert Complete Works for Violin and Piano, Vol. 2
Schubert Complete Works for Violin and Piano, Vol. 1
Violin Sonata (Sonatina) in D Major, Op. 137 No. 1, D. 384: I. Allegro molto
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Violin Sonata (Sonatina) in D Major, Op. 137 No. 1, D. 384: II. Andante
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Violin Sonata (Sonatina) in D Major, Op. 137 No. 1, D. 384: III. Allegro vivace
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Violin Sonata (Sonatina) in A Minor, Op. 137 No. 2, D. 385: I. Allegro moderato
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Violin Sonata (Sonatina) in A Minor, Op. 137 No. 2, D. 385: II. Andante
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Violin Sonata (Sonatina) in A Minor, Op. 137 No. 2, D. 385: III. Menuetto and Trio
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Violin Sonata (Sonatina) in G Minor, Op. 137 No. 3, D. 408: I. Allegro giusto
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Violin Sonata (Sonatina) in G Minor, Op. 137 No. 3, D. 408: III. Menuetto and Trio
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Violin Sonata (Sonatina) in G Minor, Op. 137 No. 3, D. 408: IV. Allegro moderato
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Rondo in B Minor, Op. 70, D. 895 "Rondeau Brilliant": Andante - Allegro
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Schubert Complete Works for Violin and Piano
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Violin Sonata in A Major "Duo", Op. 162, D. 574: I. Allegro moderato
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Violin Sonata in A Major "Duo", Op. 162, D. 574: II. Scherzo
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Violin Sonata in A Major "Duo", Op. 162, D. 574: III. Andantino
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Fantasy in C Major, Op. 159, D. 934: I. Andante molto
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Fantasy in C Major, Op. 159, D. 934: II. Allegretto
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Violin Sonata (Sonatina) in A Minor, Op. 137 No. 2, D. 385: IV. Allegro moderato
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Fantasy in C Major, Op. 159, D. 934: III. Andantino
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Fantasy in C Major, Op. 159, D. 934: IV. Allegro - Allegretto - Presto
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Violin Sonata (Sonatina) in G Minor, Op. 137 No. 3, D. 408: II. Andante
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Fantasia in F Minor for Piano Duet, Op. 103, D. 940: I. Allegro molto
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Fantasia in F Minor for Piano Duet, Op. 103, D. 940: II. Largo
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Fantasia in F Minor for Piano Duet, Op. 103, D. 940: I.II. Allegro vivace
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Fantasia in F Minor for Piano Duet, Op. 103, D. 940: IV. Tempo I
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Schubert: 6 Moments musicaux & Piano Sonata
Piano Sonata No. 20 in A Major, D. 959: II. Andantino
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Piano Sonata No. 20 in A Major, D. 959: III. Scherzo - Allegro Vivace
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6 Moments musicaux, Op. 94, D. 780: I. in C Major
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6 Moments musicaux, Op. 94, D. 780: II. in A-Flat Major
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6 Moments musicaux, Op. 94, D. 780: III. in F Minor
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6 Moments musicaux, Op. 94, D. 780: IV. in C-Sharp Minor
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6 Moments musicaux, Op. 94, D. 780: VI. in A-Flat Major
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XIXth Clara Haskil Competition 2001 (Live Recording)
Bach: Partita No. 6 in E Minor, BWV 830: I. Toccata
Partita No. 6 in E Minor, BWV 830: I. Toccata
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Souvenir d'un lieu cher, Op. 42, TH 116: No. 3, Mélodie
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Rachmaninoff: Sonata for Cello and Piano in G Minor, Op. 19: III. Andante
Sonata for Cello and Piano in G Minor, Op. 19: III. Andante
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Piano Concerto No. 24 in C Minor, K. 491: II. Larghetto
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Piano Concerto No. 24 in C Minor, K. 491: III. Allegretto
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Weinberg: Sonata for Cello No. 2, Op. 63: I. Moderato
Sonata for Cello No. 2, Op. 63: I. Moderato
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