Lev Nikolayevich Oborin (); (Moscow, Moscow, 5 January 1974) was a Soviet and Russian pianist, composer and pedagogue. He was the winner of the first International Chopin Piano Competition in 1927. L
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe588821f338ba06d280ab7c3cafdaabcede368ff604e70560ea521ca3fccc4a1. 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/b70ad35b-4965-49ba-95e1-a2fa7674505b.json and https://artists.proofprofile.net/proofs/artist/b70ad35b-4965-49ba-95e1-a2fa7674505b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: Violin Concerto in D Major, Op. 61 & Violin Sonata No. 7 in C Minor, Op. 30 No. 2 (Live)
Tartini: Devil's Trill Sonata; Violin Concertos D12, D51, D80, & D115
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd85e93074aba1b9985da157c76528434790f9043155e62094d7fd068816d52. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761528301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c050851b63fe08acf2c1d0f4a081ad7a66b20ea3c8bbcb5cc9599249bd6f5c0. 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/USX761528302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c70c8cdfba41358f25516a198561cf9d4b799c30e44a62ccaab42ad134ba34. 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/USX761528303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6225d5fe19aebe0277e819598cf545406b8167c1aacc0ebce9440154f13fc5c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761528304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a7c0056b480d464e2de03ba6b00fb2d285733e26d2405cf8691118766d8410. 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/USX761528305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffb6951802e7643d00339565cd3da80f59aad840e176c4540829a25183514e0. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761528306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6233ce05aa6aaad35b6a6729ebe815950e6932c5f107df6986cc7933f44630. 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/USX761528307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf161025a1309bc7c854b1d8772bcc47591e9bf84f5762500b160aa5d3a388adc. 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/USX761528308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1cd9e0f899a98edb48dfbf3b696898ac560f23b4265744fdfd7b70fa2c0487f. 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/USX761528309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09feb064699899434e9c64db3eaa88e495c5f745cb1df2d3c0daf16bc9750d6. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/USX761528310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ad2533d7f0135c7410b09a3a230924419389b54a7d61ad8b814549f8da03a0. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USX761528311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fee34fa9bc0507f9f31d7cf3a6cf6b16257700438d7017c99ac832748c18d8. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761528312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4275ffda1de0ef56d436783ac5a78b4848f6e358b82264c99ac621e60c3bc95f. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761528314.
Violin Sonata in G Minor "Devil's Trill"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85fb6e9f828db03351f33a5faec0f4e9ff0931d28646c8d9b485117e3ce56fd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USX761528315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7370305a5b67b15dc62f75d4cd83b954c22704f1ca22e5fa51940d99b92e6687. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761528316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a20cc6f95292c6c193d26da000d74e597619811abe3994053992a2d2d4bbb6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USX761528317.
The Moscow Conservatory - Tribute to Rachmaninov. Archive Recordings
Schubert: Piano Trio No. 1, Piano Quintet "The Trout"
Violin Masterpieces: Oistrakh Plays Bach, Mozart & Tartini
David Oistrakh Plays Works for Violin and Piano
Beethoven: Triple concerto pour piano, violon, violoncelle
Beethoven: Sonata For Piano And Violin No. 9 in A Major, Op. 47 "Kreutzer" - Sonata For Piano and Violin No. 10 in G major, Op. 96
Beethoven: Sonata For Piano And Violin No. 7 In C Minor, Op. 30 - Sonata For Piano And Violin No. 8 In G Major, Op. 30
Beethoven: Sonata For Piano And Violin No. 4 in A Minor, Op. 23 - Sonata For Piano And Violin No. 5 In F Major, Op. 24 "Spring" - Sonata For Piano And Violin No. 6 In A Major, Op. 30
Beethoven: Sonata For Piano And Violin No. 1 In D Major, Op. 12 - Sonata For Piano And Violin No. 2 In A Major, Op. 12 - Sonata For Piano And Violin No. 3 In E Flat Major, Op. 12
Schubert: Piano Trio, Op. 99, D. 898, Lev Oborin vs. David Oistrakh vs. Sviatoslav Knushevitsky vs. Arthur Rubinstein vs. Jascha Heifetz vs. Emanuel Feuermann (Compare 2 Versions)
Oistrach, Knushevitsky and Oborin Play Schumann & Mendelssohn
Finest Recordings - Beethoven Sonatas for Violin & Piano: David Ostrakh, Lev Oborin
Beethoven: Sonata for Violin and Piano No. 8 & Symphony No. 6
Oistrakh Collection, Vol. 11: The Beethoven Violin Sonatas (Live)
Beethoven: Triple Concerto, Op. 56 & Piano Trio in C Minor, Op. 1 No. 3
Beethoven: Triple Concerto in C Major, Op. 56
Chopin / Dvorák / Ravel / Smetana: Piano Trios
Chopin: Trio Op 8 - Smetana: Trio Op. 15 - Dvořák: Trio Op. 90 - Ravel: Trio in a Minor
Beethoven: Piano Trio No. 7 & Triple Concerto
David Oistrakh Collection, Vol. 12: Trios
Oistrakh Collection, Vol. 3: Schubert Piano Trios Nos. 1 & 2
Franz Schubert: Schubertiade - Kammer Musik 1
Sonata For Violin And Piano No. 1 In D, Op. 12 No. 1: 2. Tema con variazioni (Andante con moto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b229b5b9955d17da1b79f27b716aadaeb165fa8f29e7e49fb72d28b2ab9ad9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506200346.
Sonata For Violin And Piano No. 7 In C Minor, Op. 30 No. 2: 2. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2297d8d818f8ed484218727b3186ec617cac1a9d992ed8f3f2c9c7bd279e467. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506200335.
Violin Sonata No. 9 in A Major, Op. 47 "Kreutzer": II. Andante con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebb9756d3b31ee818513ea4d9281a049ab637bf34147b1a9019bac2d45373e9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA506200326.
Sonata For Violin And Piano No. 2 In A, Op. 12 No. 2: 1. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ed2863d1a1c2acbafc31327374e8185e76524ea5aa50dcae05edd99a7e83ce. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506200338.
Sonata for Violin and Piano No. 5 in F, Op. 24 - "Spring": 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332151dff9b1989ad8f132d16ac4a274a03c6496cd3df95145d9d3ab0f4e2a9a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506200318.
Sonata for Violin and Piano No. 5 in F, Op. 24 - "Spring": 3. Scherzo (Allegro molto)
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Sonata For Violin And Piano No. 1 In D, Op. 12 No. 1: 1. Allegro con brio
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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
Violin Sonata No. 9 in A Major, Op. 47 "Kreutzer": I. Adagio sostenuto - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43d5abf3c7babb8a98dfa3e84000db4eb728376d7801a0c4c9cae10edd348f8. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506200325.
Sonata For Violin And Piano No. 1 In D, Op. 12 No. 1: 3. Rondo (Allegro)
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Sonata For Violin And Piano No. 2 In A, Op. 12 No. 2: 2. Andante più tosto allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5242abb2cc52f40d1ba031b4740f0ccba19dc15801642785e300bfc6cd5b46f5. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/NLA506200339.
Sonata for Violin and Piano No. 5 in F, Op. 24 - "Spring": 2. Adagio molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46a91a0965432ade7b2d462c72e7b348a3225c26f9b5be0b62dc385f4d903be. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506200319.
Sonata for Violin and Piano No. 5 in F, Op. 24 - "Spring": 4. Rondo (Allegro ma non troppo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4041a6b2b0e904466b892e4298a1bc11e5fdd4d598426df9abaa5e19b9fdc53. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NLA506200321.
Sonata For Violin And Piano No. 3 In E Flat, Op. 12 No. 3: 2. Adagio con molt' espressione
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d4e55d6cc0a672732e5a69ccb8bb3beb374e566b144d316887d94ae7038bca. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLA506200332.
Sonata for Violin and Piano No. 6 in A, Op. 30 No. 1: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0c4a1195db8b6478a8654e755fa9a98c762dd92e5fea289c1102a8148ae080. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506200322.
Sonata For Violin And Piano No. 3 In E Flat, Op. 12 No. 3: 3. Rondo (Allegro molto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b2b1653cf6b08977642afe86153c45c64e5a7f3bafaaa1a273c9cde6cc303b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506200333.
Sonata for Violin and Piano No. 6 in A, Op. 30 No. 1: 3. Allegretto con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59c597eb0bb0902eb51577b7969f17b2ff0d73b41666728d1f166eefffd5ac8. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/NLA506200324.
Oistrakh Collection, Vol. 9: Mendelssohn Piano Trios
Oistrakh Collection, Vol. 4: Beethoven Triple Concerto
Beethoven: Violin Sonatas Nos. 6-8 (Live)
Schubert: Trio pour piano et cordes, D. 898 (Collection trésors, stéréo version)
Schubert: Trio pour piano et cordes No. 1 (Mono Version)
Beethoven: Sonates pour violon et piano Nos. 5 "Le printemps" & 9 "À Kreutzer" (Mono Version)
Beethoven: Triple concerto, Op. 56 (Mono Version)
Schubert: Piano Trio No. 1, Op. 99, D. 898
Beethoven: Piano Trio No. 7, Op. 97 "Archduke" - Schubert: Piano Trio No. 1, D. 898 & Octet in F Major, D. 803 (Remastered 2024)
Beethoven: Piano Trio No. 7 in B-Flat Major, Op. 97 "Archduke": I. Allegro moderato
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Schubert: Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: II. Andante un poco mosso
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Schubert: Octet in F Major, Op. 166, D. 803: I. Adagio - Allegro
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Beethoven: Piano Trio No. 7 in B-Flat Major, Op. 97 "Archduke": II. Scherzo. Allegro - Coda
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Beethoven: Piano Trio No. 7 in B-Flat Major, Op. 97 "Archduke": III. Andante cantabile
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Beethoven: Piano Trio No. 7 in B-Flat Major, Op. 97 "Archduke": IV. Allegro moderato - Presto
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Schubert: Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: I. Allegro moderato
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Schubert: Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: III. Scherzo
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Violin Sonata No. 1 in D Major, Op. 12 No. 1: I. Allegro con brio (Live)
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