Arvo Pärt (; born 11 September 1935) is an Estonian composer. Since the late 1970s, Pärt has worked in a minimalist style that employs tintinnabuli, a compositional technique he invented. Pärt's music
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 0xc9984a638a3c68fe9c82fa0ea0bace4502bc78d02e09337bf6ec258697120492. 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/59da4a6f-3921-42aa-a3f5-cfb39a5f89ee.json and https://artists.proofprofile.net/proofs/artist/59da4a6f-3921-42aa-a3f5-cfb39a5f89ee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Part: Stabat Mater; Magnificat & Nunc dimittis; Es sang vor langen Jahren etc
Christmas at St George's Chapel, Windsor
The Choir of St George's Chapel, Windsor Castle
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 0x21a3014838035c1ee1209a7435566207edfd6a103d90bc83cb31670c3abf6135. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJY1928114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df19c64e6d5f93b62da943e7a5dacd477c65c1b383209f6aab2bfabbe166c90. 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/GBUM71501026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8fa982ec8f89b42d8a8c62cdad50ade8449b6f0561f4fa497bc4535ba83f62. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB332280001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0b092b0319ea6c2becd707ef36b20b71a6a31650adc61e753bac386485edee. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB332280002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3e968143305c2626a548a8dd8f8798b59de7070469d4cc09751ded778caaa2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB332280003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad4686f8fb09486c156c9c9c3d5622312cf8bae3d686f26b30b5fcc85f6c804. 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/DEB332280005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc57164e5523694717d89e1066c5f72ac760ff516e9119961395aae71b44f09a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB332280006.
Greater Antiphons: VI. O King of all People
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56e508913190d63c6d66c664f04c24ca9e873e1b14c8a4997602a5f592df71c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB332280007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf831006b851248ee58b9e3575f066a23cb4f207f47cff67905a554627458c4ad. 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/DEB332280014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb9263ba9f81f18d277da2f6107faa8188f805cd93735ef72c9903c2bc70322. 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/DEB330805008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ddd8de384b8cf126f83291acb9d9b6969057edcada4f0260fc5873113e5d5b4. 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/DEB330805009.
Kusskuss, Kallike / Weihnachtliches Wiegenlied Single
Kusskuss, kallike (Estnisches Wiegenlied)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a56060f53c5bfd52d13ee3f5d386ec0b47d76ed8d5e1bcf0702733b674df8c7. 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/NLB151500352.
Spiegel im Spiegel (Version for Violin & Piano) - Version for Violin and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af575f703247ec3766cd92e55dea24ff1cfeaf3b0d4bcaab69524a74cf1a828. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB339559101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3757637ccb2e322b94f907c7e5ce88137d25c34ba31000e472cecb1d4a8d8b53. 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/DEB339559102.
Spiegel im Spiegel (Version for Cello & Piano) - Version for Cello and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a3d4803810764a2bab9941f594c9b2d90c236b7fab65ea207c2dab585d255b. 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/DEB339559103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cbd9d088f1548886b2aeeada9184c2cbf00cc5dc2bb6114157102aadd2dfaa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB339559104.
Spiegel im Spiegel (Version for Violin & Piano) - Version for Violin and Piano / Reprise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ce9e7f2100ea2cf875c901559f91cc974ca7f6867b4dcb7ad0a934e079c1f2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB339559105.
Pärt: Fratres (1991 Version for String Orchestra and Percussion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc902072c8e6e913c2b9c3614fabefcaf1b5a3373039467731cd66a51e1154d14. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0003349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525dbe0d9c000b935bc4ba57aa7217e1b7a8e70fc50545f1a2cc84d808b65fb4. 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/DEB330746601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542772a1de0e4aebf4360b87eaf8680070ec10e5eaec9508103a9d65e55f1c97. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB330746603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716bff379f5e4915561440ff5f0b4cf41e146ef66b9fce04d20aa7f0e9f5a4c4. 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/DEB330746605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4748e3e5ece90981df78b4bdfd318e21bd018e0e4740b363e09d98a8a7035ce6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEB330746606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1205831d59b95d19ed8ed2fae7be87030a7b0e64df5a48e998d12ac90e95f3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB330746608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35155ca6fe39fb57e06d4c594d7c30c097c2c984ec00ef15e8e28e1e4cc9dd5b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB330746612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59d5f4c1235f559338323b36f827f38ed41c77b896ec19dd286c7d75b4f8226. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CALC41000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d6f4953a9db69beb511d8c0ced1097b068b164cb51093976a75d02e9c52723. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CALC41000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a364f4882c227619cff7bb7b0199b23926ae5a5ad9e6db3f5391da1222e4a5e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CALC41000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45f37e514da3de3b7abdb8b8149fe708991187751e2ec4fb147af5f99c6af10. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CALC41000104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd027b06e75edcfd4e42b9ddbb3ccb27949936a84c99e5a690819428cbb9eeced. 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/CALC41000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6372dcefe7099766d54742a993864e9e70d6483dd1d092c03ccde6089166fb5c. 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/CALC40600383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4d9f9c6acc41347241d5d7da06175a79978f8c84f95fb76ff2a6860de85927. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70902410.
Pärt: Cantus In Memoriam Benjamin Britten
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7d9a7017eb1db763faa1526febb17f94c14fccd75cffd412b576109756cdd2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBUM71202449.
Part: Spiegel Im Spiegel / Fratres / Fur Alina
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae20de2ee8fc19f5412a87bcb5150d12eb7459c33de6ae16002c964904aae84. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USTE10309387.
Zzz - Classical Dream. Music for Deep Sleep
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Vivaldi: Flute Concerto in G Minor, Op. 10 No. 2, RV 439 "La notte": III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd762500519bb16b32c6e4148e0df021d74a772815f4475d3ae0a648a7d28e8. 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/GBAYC0501759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9275345e69ac931bc707398b8ae29effb27d69d7da021c3e623dc23461e4afdf. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBAYC0002318.
Brahms: 5 Lieder, Op. 49: No. 4, Wiegenlied (Arr. Mørk for Piano & Cello)
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Mozart: Eine kleine Nachtmusik, K. 525: III. Menuetto. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86153f3ff695249fac00ea78c347764905501675ce3bba5935d85d21324545cf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9302702.
Vivaldi: Flute Concerto in G Minor, Op. 10 No. 2, RV 439 "La notte": I. Largo
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Traditional: El noi de la mare (Arr. Llobet for Guitar)
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Saint-Saëns: 2 Chœurs, Op. 68: No. 1, Calme des nuits
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Tchaikovsky / Arr. Stetsuk for Cello and Orchestra: 16 Children's Songs, Op. 54: No. 10, Lullaby in a Storm
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Humperdinck: Hänsel und Gretel, Act 2: "Abends, will ich schlafen gehn" (Hänsel, Gretel)
Symphonieorchester des Bayerischen Rundfunks
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Mozart: Serenade for Winds No. 12 in C Minor, K. 388 "Nachtmusik": III. (b) Trio in canone al roverscio
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Vivaldi: Flute Concerto in G Minor, Op. 10 No. 2, RV 439 "La notte": V. Il sonno. Largo
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Tchaikovsky: Mazeppa, Act 3: Maria's Lullaby (Arr. Milstein for Violin and Piano)
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Telemann: Oboe Concerto in F Minor, TWV 51:f1: II. Largo e piano
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Britten: 2 Lullabies for Two Pianos: No. 2, Lullaby for a Retired Colonel
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Schumann: Kinderszenen, Op. 15: No. 7, Träumerei
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Tchaikovsky: Children's Album, Op. 39: No. 21, Sweet Dreams
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Tchaikovsky: 16 Children's Songs, Op. 54: No. 10, Lullaby in a Storm
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Anonymous: Lullaby, Lullow "I Saw a Swete Semly Syght"
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Gershwin: 3 Preludes: No. 2, Andante con moto "Blue Lullaby"
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Purcell: Funeral Sentences: Man That Is Born of a Woman, Z. 27
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Arvo Pärt: Magnificent Magnificat, 80ème anniversaire
Patterns in Motion - The Great Minimalists, Vol. II
Spiegel im Spiegel for Violin and Piano (1978)
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