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 0x410e237c3843c483b8a0a834af648b96ac9bcf030ca7f67fd65229dcf74cde8c. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c8e494c-3223-4608-addb-be10315337ba.json and https://artists.proofprofile.net/proofs/artist/9c8e494c-3223-4608-addb-be10315337ba.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x73672e2f43686ae024c2669bb6eba05890859f5aa5396331976d234bb7b9e71e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRZ149318010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43626f7f2aedd3405d5c9984d1eef503b5393f66c53c1f19364f2fc8b355b58. 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/FRZ149318110 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81610dff13c84755f633db38e5b169ba3f859ce32c4a0b430d3dd87658e4997. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FRZ149318130 — a six-check JSON result.
Loewe: Lieder (Selection); Frauenliebe, Op. 60
Mozart: Piano Concertos No.13 KV 415 & No.15 KV 450
Piano Concerto No. 13 in C Major, K. 415: I. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72ba29a5d3de9c05624d643f03952303b095788adb04e7c69d3a08040f8d33c. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/DEF059002112 — a six-check JSON result.
Piano Concerto No. 13 in C Major, K. 415: II. Andante - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1240d7ed9f26cc6b44df8366a399adfe609071dbf44acb5e04a184f757b5d80f. 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/DEF059002113 — a six-check JSON result.
Piano Concerto No. 13 in C Major, K. 415: III. Rondeau. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f613f41c30b14aca96c3df54a2e1ddcac804e8a2a76147834db8a5343573ebe. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DEF059002114 — a six-check JSON result.
Piano Concerto No. 15 in B-Flat Major, K. 450: I. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198fee6aa2a07a86412d6967ab5c971c83f638a3c20aa83048f7c92a50a98801. 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/DEF059002121 — a six-check JSON result.
Piano Concerto No. 15 in B-Flat Major, K. 450: II. Andante - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d4f824b41a784edada69919d0ae340f6a7aed5de95b2a161f43ba166b677af. 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/DEF059002122 — a six-check JSON result.
Piano Concerto No. 15 in B-Flat Major, K. 450: III. Finale. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98306f7fea8c07ec52a3dbd60cd2c4a5df25dd6f3a41bc6f53398331097ad03a. 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/DEF059002123 — a six-check JSON result.
Piano Concerto No. 20 in D Minor, K. 466 - Cadenzas: Ludwig van Beethoven: I. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c343fda2741adc7e0c0dc69dc89d08c7006b74f27d0a4797c37ea2847ba177. 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/DEF058902352 — a six-check JSON result.
Piano Concerto No. 20 in D minor, K.466: II. Romance - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b558a65bdfe1a30ea51d474d795424c5df7ff43d4ae82a9302e437a768448d0. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEF058902353 — a six-check JSON result.
Piano Concerto No. 20 in D minor, K.466: III. Rondo (Allegro assai) - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d0c338ddca4e9b8f648ee246f032c7127fd38bf46cfc84a3e5ffbef4e7bd76. 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/DEF058902354 — a six-check JSON result.
Piano Concerto No. 25 in C, K.503: I. Allegro Maestoso - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9791ed8a1778cd4847e33ccd3f024a09710f4356badd8945e7323a5d15c418. 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/DEF058902361 — a six-check JSON result.
Piano Concerto No. 25 in C, K.503: II. Andante - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce7510dae16d3128617ab82e04119c1c0a111ac2af9ab5df99d8fddd6cff07b. 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/DEF058902362 — a six-check JSON result.
Piano Concerto No. 25 in C, K.503: III. Allegretto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80fb069faa696950e6b8f4a54be1f11b2f5face5a20a57a03955ec5177f35534. 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/DEF058902363 — a six-check JSON result.
Wagner: Der Ring des Nibelungen, WWV 86 (Excerpts Arr. H. Behn for 2 Pianos)
Brahms: 4 Ernste Gesänge, Op. 121 / Wolf: Michelangelo Lieder / Mahler: Rückert Lieder
Rückert Lieder: Blicke mir nicht in die Lieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67eb05e6e1ed1ab552f88a5ec6103260533df81918c6704295b32b34022359a9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEF058904351 — a six-check JSON result.
Rückert Lieder: Ich atmet' einen linden Duft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178c073ac93b453f5958742b4d1bc8c82abd2e204ae56d452083749d5ed6e3f0. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEF058904352 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3b30185efec4a88191b39a078a1fc317b684af468da3e5bd0c705bedc36e75. 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/DEF058904353 — a six-check JSON result.
Rückert Lieder: Ich bin der Welt abhanden gekommen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919b39bf676e0723d92aa78580f545b725afd52bd3a0c9e3cb041305fa6452b7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF058904354 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7de6df2d00d626b0c15d2ac05cd903b25bcded7262ac6cc2b252b16c7ad1ea. 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/DEF058904355 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64eac203ff37cd5fb90c6632832cf2b462a84d0de76e3dc07ebbb3dfea76abe. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058830704 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a09d71e70f3d34305937b1896a2fdfc9c7ef00f0ff5723f4b76d58d520232d9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEF058802721 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad98d36c806b4614aa2a5bb01cf35aaa9406de0a18e0f9b24617f37429f1c1ed. 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/DEF058802723 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada5330ef1d6aaf4676bc085d9cf0809e6445d76581b40340ecf419dcfe71eac. 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/DEF058830711 — a six-check JSON result.
6 Songs Op. 13: 4. Als ihr Geliebter schied
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6 Songs Op. 13: 6. Sie kam zum Schloss gegangen
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Walzer Gesänge nach toskanischen Volksliedern v.Ferd.Gregorovius op. 6 (Waltz-songs on Tuscan Folk Lyrics by F.Gregorovius,op.6): 1. Liebe Schwalbe
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed60c12c83a503bedadbaa31beca3e74a0e860d17748e3a7735edda22c58bf3d. 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/GBAYC8805771 — a six-check JSON result.
Berlioz: Overture "Waverley", Op. 1, H. 26
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Lenz Wanderer, Mörder, Triumphator: No. 2, Lenz Mörder
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Wagner: Tristan und Isolde, WWV 90 (Arr. H. Behn for 2 Pianos)
Dietrich Fischer-Dieskau sings Beethoven, Mahler and Schumann Duos with Julia Varady
Mendelssohn: Piano Concertos Op. 25 & Op. 40 - Six Songs Without Words: Chamber Arrangements
Six Songs Without Words, Op. 19, MWV K 56 (Arr. for Chamber Music by Cord Garben): N° 1 Frühlingslied: In dem Walde, süsse Tone
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Six Songs Without Words, Op. 30, MWV U 103 (Arr. for Chamber Music by Cord Garben): I. Andante espressivo "Contemplation"
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Six Songs Without Words, Op. 38, MWV U 115 (Arr. for Chamber Music by Cord Garben): II. Allegro non troppo, Bonheur perdu
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Six Songs Without Words, Op. 38, MWV U 119 (Arr. for Chamber Music by Cord Garben): VI. Duetto
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Six Songs Without Words, Op. 62, MWV U 185 (Arr. for Chamber Music by Cord Garben): I. Andante espressivo, Brise de mai
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Six Songs Without Words, Op. 67, MWV U 102 (Arr. for Chamber Music by Cord Garben): III. Andante tranquillo, Chant du pèlerin
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Mendelssohn: Lieder Ohne Worte (Songs Without Words)
Brahms: Tragic Overture, Op. 81 / Piano Concerto in D Minor, Op. 15, Arranged for Piano 4 Hands
Toccata and Fugue in D Minor, BWV 565 (Arr. by Cord Garben): I. Toccata
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Toccata and Fugue in D Minor, BWV 565 (Arr. by Cord Garben): II. Fugue
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Suite No. 2 in B Minor, BWV 1067: I. Ouverture
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Suite No. 2 in B Minor, BWV 1067: VIII. Badinerie
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Violin Concerto No. 1 in A Minor, BWV 1041 (Arr. by Cord Garben): I. Allegro
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Suite No. 3 in D Major, BWV 1068: II. Air
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Harpsichord Concerto No. 5 in F Minor, BWV 1056 (Arr. by Cord Garben): I. Moderato
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Harpsichord Concerto No. 5 in F Minor, BWV 1056 (Arr. by Cord Garben): II. Largo
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Mahler-Werfel: Complete Songs - Zemlinsky: Songs, Op. 7
Loewe: Lieder & Balladen (Complete Edition), Vol. 18
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Don Giovanni, K. 527: In quali eccessi, o Numi - Mi tradì, quell'alma ingrata
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Don Giovanni, K. 527: Crudele? Ah, no, mio bene! - Non mi dir, bell'idol mio
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Mahler: Lieder Eines Fahrenden Gesellen / Kindertotenlieder / Ruckert-Lieder
Art & Music: Van Gogh - Music of His Time
Piano Concerto No. 1 in E Flat Major, S. 124: I. Allegro maestoso
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Fantasia on Hungarian Folk Tunes, S. 123
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Hungarian Rhapsody No. 1 in C Sharp Minor, S. 244
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Piano Concerto No. 1 in E Flat Major, S. 124: II. Quasi adagio - Allegretto vivace - Allegro animato
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Hungarian Rhapsody No. 2 in D minor, S.359 No. 2 (Corresponds with piano versionNo. 2 in C sharp minor) - Orch. Doppler
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Hungarian Rhapsody No. 2 in C Sharp Minor, S. 244
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Piano Concerto No. 1 in E Flat Major, S. 124: III. Allegro marziale animato
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Hungarian Rhapsody No. 3 in B Flat, S. 244
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Piano Concerto No. 2 in A Major, S. 125: I. Adagio sostenuto assai - Allegro agitato assai
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Hungarian Rhapsody No. 4 in E Flat, S. 244
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Piano Concerto No. 2 in A Major, S. 125: II. Allegro moderato - Allegro deciso
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Hungarian Rhapsody No. 5 in E Minor, S. 244 Heroïde-Elégiaque
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Piano Concerto No. 2 in A Major, S. 125: III. Marziale un poco meno allegro
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Hungarian Rhapsody No. 6 in D Flat, S. 244
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Piano Concerto No. 2 in A Major, S. 125: IV. Allegro animato - Stretto (molto accelerando)
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Hungarian Rhapsody No. 7 in D Minor, S. 244
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Hungarian Rhapsody No. 8 in F Sharp Minor, S. 244
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Hungarian Rhapsody No. 9 in E Flat, S. 244 "Pesther Carneval"
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Hungarian Rhapsody No. 10 in E, S. 244 "Preludio"
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Paris 1900: The Old and the New: Debussy, Ravel, Saint-Saëns, Satie
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Sonatine, M. 40: II. Mouvement de menuet
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Songs and Mélodies at the Turn of the Century Vol. 4