thumb|Claudio Arrau in 1974, by Allan Warren Claudio Arrau León (; February 6, 1903June 9, 1991) was a Chilean and American pianist known for his interpretations of a vast repertoire spanning the baro
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 0x7f97dc24a9db772bb0903a50e8820402047c2504bcf12b749efe108222deff89. 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/0022db92-43f0-4807-bf14-06873d7c186e.json and https://artists.proofprofile.net/proofs/artist/0022db92-43f0-4807-bf14-06873d7c186e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
The Complete Warner Classics Recordings: The LP Era (1955-1962)
Chopin: 12 Études, Op. 10: No. 1 in C Major
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 0xf4b563eb95bb4ce2d96e4bdb9b3213ad13cbf293b3efdaefed2a49d0d5ef2401. 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/GBAYC2200336 — a six-check JSON result.
Chopin: 12 Études, Op. 10: No. 2 in A Minor "Chromatique"
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Chopin: 12 Études, Op. 10: No. 3 in E Major "Tristesse"
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Chopin: 12 Études, Op. 10: No. 5 in G-Flat Major "Black Keys"
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Chopin: 12 Études, Op. 10: No. 6 in E-Flat Minor
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Chopin: 12 Études, Op. 10: No. 7 in C Major
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Chopin: 12 Études, Op. 10: No. 8 in F Major
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Chopin: 12 Études, Op. 10: No. 9 in F Minor
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Chopin: 12 Études, Op. 10: No. 10 in A-Flat Major
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Chopin: 12 Études, Op. 10: No. 11 in E-Flat Major
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Chopin: 12 Études, Op. 10: No. 12 in C Minor
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Chopin: 12 Études, Op. 25: No. 1 in A-Flat Major "Aeolian Harp"
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Chopin: 12 Études, Op. 25: No. 2 in F Minor
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Chopin: 12 Études, Op. 25: No. 3 in F Major
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Chopin: 12 Études, Op. 25: No. 4 in A Minor
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Chopin: 12 Études, Op. 25: No. 5 in E Minor
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Chopin: 12 Études, Op. 25: No. 6 in G-Sharp Minor
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Chopin: 12 Études, Op. 25: No. 7 in C-Sharp Minor
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Chopin: 12 Études, Op. 25: No. 8 in D-Flat Major
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Chopin: 12 Études, Op. 25: No. 9 in G-Flat Major "Butterfly"
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Chopin: 12 Études, Op. 25: No. 10 in B Minor
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Chopin: 12 Études, Op. 25: No. 11 in A Minor "Winter Wind"
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Chopin: 12 Études, Op. 25: No. 12 in C Minor
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Tchaikovsky: Piano Concerto No. 1, Op. 23 - Weber: Konzertstück, Op. 79
Weber: Konzertstück in F Minor, Op. 79, J. 282: I. Larghetto affettuoso
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Weber: Konzertstück in F Minor, Op. 79, J. 282: II. Allegro passionato
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Tchaikovsky: Piano Concerto No. 1 in B-Flat Minor, Op. 23: I. Allegro non troppo e molto maestoso - Allegro con spirito
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Tchaikovsky: Piano Concerto No. 1 in B-Flat Minor, Op. 23: II. Andantino semplice - Prestissimo - Tempo I
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Tchaikovsky: Piano Concerto No. 1 in B-Flat Minor, Op. 23: III. Allegro con fuoco
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Grieg, Schumann & Beethoven: Piano Concertos
Grieg: Piano Concerto in A Minor, Op. 16: I. Allegro molto moderato - Cadenza
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Grieg: Piano Concerto in A Minor, Op. 16: II. Adagio
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Brahms, Beethoven & R. Schumann: Piano Concertos (Live)
Beethoven: Piano Concerto No. 2, Op. 19 & Piano Sonata No. 7, Op. 10 No. 3
Beethoven: Piano Concerto No. 5, Op. 73 "Emperor" & Piano Sonata No. 22, Op. 54
Beethoven: Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": II. Adagio un poco mosso
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Beethoven: Piano Concerto No. 1, Op. 15 & Piano Sonata No. 7, Op. 10 No. 3
Beethoven: Piano Concerto No. 3, Op. 37 & Piano Sonata No. 28, Op. 101
Beethoven: Piano Concerto No. 4 in G Major, Op. 58
Brahms: Piano Concerto No. 1. Op. 15 (Live Recording, Lausanne 1978)
Brahms: Violin Concerto in D Major, Op. 77 - Schumann: Piano Concerto in A Minor, Op. 54 (Live)
Violin Concerto in D Major, Op. 77: I. Allegro non troppo - Live
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24 Preludes, Op. 28: No. 1 in C Major. Agitato
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24 Preludes, Op. 28: No. 2 in A Minor. Lento
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24 Preludes, Op. 28: No. 3 in G Major. Vivace
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24 Preludes, Op. 28: No. 4 in E Minor. Largo
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24 Preludes, Op. 28: No. 5 in D Major. Molto allegro
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24 Preludes, Op. 28: No. 6 in B Minor. Lento assai
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24 Preludes, Op. 28: No. 7 in A Major. Andantino
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24 Preludes, Op. 28: No. 8 in F-Sharp Minor. Molto agitato
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24 Preludes, Op. 28: No. 9 in E Major. Largo
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24 Preludes, Op. 28: No. 10 in C-Sharp Minor. Molto allegro
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24 Preludes, Op. 28: No. 11 in B Major. Vivace
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24 Preludes, Op. 28: No. 12 in G-Sharp Minor. Presto
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24 Preludes, Op. 28: No. 13 in F-Sharp Minor. Lento
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24 Preludes, Op. 28: No. 14 in E-Flat Minor. Allegro
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24 Preludes, Op. 28: No. 15 in D-Flat Major "Raindrop Prelude"
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24 Preludes, Op. 28: No. 16 in B-Flat Minor. Presto con fuoco
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24 Preludes, Op. 28: No. 17 in A-Flat Major. Allegretto
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24 Preludes, Op. 28: No. 18 in F Minor. Molto allegro
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24 Preludes, Op. 28: No. 19 in E-Flat Major. Vivace
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24 Preludes, Op. 28: No. 20 in C Minor. Largo
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24 Preludes, Op. 28: No. 21 in B-Flat Major. Cantabile
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24 Preludes, Op. 28: No. 22 in G Minor. Molto agitato
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24 Preludes, Op. 28: No. 23 in F Major. Moderato
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24 Preludes, Op. 28: No. 24 in D Minor. Allegro appassionato
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Prelude in C-Sharp Minor, Op. 45. Sostenuto
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Prelude in A-Flat Major, KK IVb/7. Presto con leggierezza
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12 Etudes d'exécution transcendante, S. 139: I. Preludio. Presto
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Waltz No. 11 in G-Flat Major, Op. 70 No. 1
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6 Chants polonais de Frédéric Chopin, S.480: 4. Drinking Song
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6 Chants polonais de Frédéric Chopin, S.480: 6. Return Home
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6 Chants polonais de Frédéric Chopin, S.480: 2. Spring
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Waltz No. 18 in E-Flat Major. Sostenuto, KK IVb/10
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Piano Concerto No. 2 in A, S.125: 4. Allegro animato
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Waltz No. 6 in D-Flat Major, Op. 64 No. 1 "Minute Waltz"
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12 Etudes d'exécution transcendante, S. 139: II. Molto vivace
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10 Harmonies poétiques et religieuses, S.173 - 3.Bénédiction de Dieu dans la solitude: Andante -
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2 Etudes de Concert, S.145: No. 2 Gnomenreigen
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Andante spianato et Grande Polonaise brillante in E flat, Op. 22: Andante spianato
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2 Etudes de Concert, S.145: No. 1 Waldesrauschen
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Piano Concerto No. 1 in E flat, S.124: 2b. Allegro animato
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12 Etudes d'exécution transcendante, S. 139: X. Etude in F Minor. Allegro agitato molto
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Piano Sonata No. 3 in F minor, Op. 5: 4. Intermezzo (Andante molto)
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6 Chants polonais de Frédéric Chopin, S.480: 5. My Darling
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Piano Sonata in B minor, S.178: Lento assai - Allegro energico
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Waltz No. 9 in A-Flat Major, Op. 69 No. 1 "Farewell"
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Beethoven: Piano Sonata No. 24 in F-Sharp Major, Op. 78 "À Thérèse": II. Allegro vivace
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Schumann: Carnaval, Op. 9: No. 12, Chiarina
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Schubert: Moments musicaux, Op. 94, D. 780: No. 3 in F Minor
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Tema & Variations I - III
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations IV - VI
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations VII & VIII
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations IX - XI
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations XII - XIV
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations XV & XVI
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations XVII & XVIII
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations XIX - XXII
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variation XXIII & XXIV
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations XXV - XXVII
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations XXVIII & XXIX
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Beethoven: 32 Variations on an Original Theme in C Minor, WoO 80: Variations XXX & XXXI
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Debussy: Préludes, Livre II, CD 131, L. 123: No. 3, La Puerta del Vino
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Mozart: Piano Sonata No. 17 in B-Flat Major, K. 570: III. Allegretto
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Liszt: Valses oubliées, S. 215: No. 1 in F-Sharp Major
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Schumann: Carnaval, Op. 9: No. 17b, Paganini
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Beethoven: Piano Sonata No. 30 in E Major, Op. 109: I. Vivace, ma non troppo
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Debussy: Estampes, CD 108, L. 100: No. 3, Jardins sous la pluie
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Schubert: Fantasy in C Major, Op. 15, D. 760 "Wanderer": IV. Allegro
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Beethoven: Piano Sonata No. 28 in A Major, Op. 101: II. Vivace all marcia
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Schubert: Moments musicaux, Op. 94, D. 780: No. 4 in C-Sharp Minor
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Granados: Goyescas "Los majos enamorados", Cuaderno II: Quejas o la maja y el ruiseñor
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Beethoven: Piano Sonata No. 7 in D Major, Op. 10 No. 3: I. Presto
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Beethoven: Piano Sonata No. 26 in E-Flat Major, Op. 81a "Les Adieux": I. Adagio - Allegro
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Mozart: Piano Sonata No. 17 in B-Flat Major, K. 570: I. Allegro
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Historical Beethoven feat. Claudio Arrau
Beethoven: Piano Concertos Nos. 3, 4 & 5 "Emperor" (Live)
Brahms: Piano Concerto No. 1 in D Minor, Op. 15: I. Maestoso
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Brahms: Piano Concerto No. 1 in D Minor, Op. 15: II. Adagio
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Brahms: Piano Concerto No. 1 in D Minor, Op. 15: III. Rondo. Allegro non troppo
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Brahms: Piano Concerto No. 2 in B-Flat Major, Op. 83: I. Allegro non troppo
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Brahms: Piano Concerto No. 2 in B-Flat Major, Op. 83: II. Allegretto appassionato
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Brahms: Piano Concerto No. 2 in B-Flat Major, Op. 83: III. Andante
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Beethoven: Piano Sonatas Nos. 23 "Appassionata" & 24
Beethoven: Piano Sonata No. 23 in F Minor, Op. 57 "Appassionata": I. Allegro assai
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Chopin: Piano Sonata No. 3 in B Minor, Op. 58
Claudio Arrau Plays Schubert (Remastered)
Chopin: Études, Op. 10 & 3 Nouvelles études
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Chopin: 3 Nouvelles Études: No. 1 in F Minor
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Chopin: 3 Nouvelles Études: No. 3 in A-Flat Major
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Schubert: Moments musicaux, D. 780 & Fantasia, D. 760 "Wanderer"
Claudio Arrau Plays Beethoven (Remastered)
Beethoven: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
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Beethoven: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": II. Allegretto
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Beethoven: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": III. Presto agitato
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Beethoven: Piano Sonata No. 21 in C Major, Op. 53 "Waldstein": I. Allegro con brio
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Chopin: Études, Op. 25, Allegro de concert, Op. 46 & Fantaisie, Op. 49
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Schubert: Klavierstücke, D. 946, Allegretto, D. 915 & March, D. 606
Beethoven: Piano Sonatas Nos. 21 "Waldstein" & 26 "Les Adieux"
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Beethoven: Piano Sonatas Nos. 30, 31 & 32
Beethoven: Piano Sonata No. 30 in E Major, Op. 109: II. Prestissimo
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Beethoven: Piano Sonata No. 30 in E Major, Op. 109: III. (a) Andante molto cantabile e espressivo
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Beethoven: Piano Sonata No. 30 in E Major, Op. 109: III. (b) Variation I. Molto espressivo
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Beethoven: Piano Sonata No. 30 in E Major, Op. 109: III. (c) Variation II. Leggiermente
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Beethoven: Piano Sonata No. 30 in E Major, Op. 109: III. (e) Variation IV. Etwas langsamer als das Thema
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Beethoven: Piano Sonata No. 30 in E Major, Op. 109: III. (f) Variation V. Allegro, ma non troppo
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Beethoven: Piano Sonata No. 30 in E Major, Op. 109: III. (g) Variation VI. Tempo I del tema
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Beethoven: Piano Sonata No. 31 in A-Flat Major, Op. 110: I. Moderato cantabile molto espressivo
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Beethoven: Piano Sonata No. 31 in A-Flat Major, Op. 110: II. Allegro molto
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Beethoven: Piano Sonata No. 31 in A-Flat Major, Op. 110: III. (a) Adagio ma non troppo
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Beethoven: Piano Sonata No. 31 in A-Flat Major, Op. 110: III. (b) Fuga. Allegro ma non troppo
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Beethoven: Piano Sonata No. 32 in C Minor, Op. 111: I. Maestoso - Allegro con brio ed appassionato
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Beethoven: Piano Sonata No. 32 in C Minor, Op. 111: II. Arietta. Adagio molto semplice e cantabile
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Brahms & Beethoven: Piano Concertos (Live)
Mozart: Piano Sonatas Nos. 12, 14 & 18 and Fantasia in C Minor (Live)
Piano Sonata No. 18 in D Major, K. 576: II. Adagio (Live)
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Piano Sonata No. 12 in F Major, K. 332: II. Adagio (Live)
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Liebestraum No. 3 in A flat, S.541 No. 3
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight Sonata": I. Adagio sostenuto
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12 Études, Op. 10: No. 11 in E-Flat Major
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Nocturne No. 2 in E-Flat Major, Op. 9 No. 2
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Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio cantabile
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Piano Sonata No. 11 In A, K.331 -"Alla Turca": 3. Alla Turca (Allegretto)
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Debussy: Clair de lune and Other Masterpieces
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