Axel Köhler (born 1960 in Schwarzenberg, Saxony, East Germany) is a German countertenor and opera director. In 1994, he won the Handel Prize. Since 2009, he has been Artistic Director of the Halle Ope
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 0x4a7d8859a039349236dec657b0690e9a8d4ab3b0fe1739ce2df3d9a007ca1157. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11038ce0-989a-4a91-8c16-cc2fd2399e57.json and https://artists.proofprofile.net/proofs/artist/11038ce0-989a-4a91-8c16-cc2fd2399e57.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mass in B Minor, BWV 232, Pt. 1: III. Chorus. Kyrie eleison (A 4)
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 0x8d6774937cc1c86be309e081a8f973bb0814fe7f01d44c7adb1b9ec254bc278b. 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/NLY331502829.
Mass in B Minor, BWV 232, Pt. 2: I. Chorus. Credo in unum Deum (A 5)
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Mass in B Minor BWV 232, Pt. 2: II. Chorus. Patrem omnipotentem (A 4)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4e7cc1dc991eeb1f3f40ee10509d52bbce0539066ec359a0101c4b4696c29f. 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/DEB261200973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d5ccd5bfe75590f85f822f395d5e092d8dfce2637fa1725c13b256aac9f5e7. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEB261200976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cf1f0b16d9f12fafe2d52020c9a51100d08806eeb41e514b9a8523038c76b6. 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/DEB261200990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438097149dbfccb2fafe60ad0c160617d259725d9c5329cb1511540d71fe20a9. 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/US2TL0923401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32caf00fffec16e9def728ecb1afe5795b35c1f97f1eef472801997bb29f602f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US2TL0923402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fed5e3c6b96294c46a3989be3dcc91abf3062c943e79fc50db623c3547aa50. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/US2TL0923403.
Festgesang, MWV D4, "Gutenberg-Kantate": No. 2. (adap. W.H. Cummings as Hark! The Herald Angels Sing)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36294629e991218f88186b3775569b8ba0c21f80c3830bfba23da2921cf3de5. 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/US2TL0923409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f68821f46ff5af804c5b2855c7ebdb7e61578d0e1881a5cf123d40d6d292cd. 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/US2TL0923410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24b01e289bb1a86f27433f856d321f1ab67523c45333419e5f8de6b1fbd40d3. 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/US2TL0923412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85edcd21efea7e46f0f48984cebeaf140b26b1868a59d7014c675de589a78fee. 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/DEB260200463.
Bach: Secular Cantatas, BWV 36c, 201, 206, 207, Quodlibet BWV 524
Schwingt freudig euch empor, BWV 36c: V. Aria. Der Tag, der dich vordem gebar (Bass)
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Schwingt freudig euch empor, BWV 36c: VI. Recit. Nur dieses Einz'ge sorgen wir (Soprano)
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Heinichen: Lamentationes / Passionsmusik
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La traviata, Act I: "Libiamo ne'lieti" (Brindisi )
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Great Composers in Words & Music: George Frideric Handel
Midnight Lounge - Chill Out Classics and Meditation
Brandenburg Concerto No. 3 in G Major, BWV 1048: I. —
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Brandenburg Concerto No. 1 in F Major, BWV 1046: I. —
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Brandenburg Concerto No. 5 in D Major, BWV 1050: I. Allegro
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Orchestral Suite No. 3 in D Major, BWV 1068: II. Air
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Orchestral Suite No. 2 in B Minor, BWV 1067: IV. Bourrée No. 1 - Bourrée No. 2
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Violin Concerto in E Major, BWV 1042: I. Allegro
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Orchestral Suite No. 3 in D Major, BWV 1068: I. Ouverture
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Violin Concerto in D Minor, BWV 1052: I. — (Reconstructed from the Harpsichord Concerto, BWV 1052)
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Harpsichord Concerto No. 2 in E Major, BWV 1053: II. Siciliano
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Brandenburg Concerto No. 2 in F Major, BWV 1047: I. —
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Partita No. 2 in C Minor, BWV 826: I. Sinfonia
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Concerto for Harpsichord No. 6 in F Major, BWV 1057: III. Allegro assai
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Brandenburg Concerto No. 4 in G Major, BWV 1049: II. Andante
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Violin Partita No. 3 in E Major, BWV 1006: I. Preludio
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Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: II. Adagio ma non tanto
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Orchestral Suite No. 2 in B Minor, BWV 1067: VII. Badinerie
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Flute Sonata in E Major, BWV 1035: III. Siciliana
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Harpsichord Concerto No. 4 in A Major, BWV 1055: II. Larghetto
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Matthäus-Passion, BWV 244, Pt. 1: I. Chorus. Kommt, ihr Töchter, helft mir klagen
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Mass in B Minor, BWV 232, Pt. 2: III. Duet. Et in unum dominum (Soprano, Alto)
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Das wohltemperierte Klavier I, Prelude and Fugue No. 1 in C Major, BWV 845: I. Prelude
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Goldberg Variations in G Major, BWV 988: I. Aria
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Jesu, nun sei gepreiset, BWV 41: I. Coro. Jesu, nun sei gepreiset
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Ein' feste Burg ist unser Gott, BWV 80: I. Coro. Ein' Feste Burg ist unser Gott
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Matthäus-Passion, BWV 244, Pt. 2: XXXIX. Chorus. Wir setzen uns mit Tränen nieder
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Herz und Mund und Tat und Leben, BWV 147, Pt. 1: I. Coro. Herz und Mund und Tat und Leben (Coro)
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Mass in B Minor, BWV 232, Pt. 1: II. Duet. Christe eleison (Two Sopranos)
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Johannes-Passion, BWV 245, Pt. 1: I. Chorus. Herr, unser Herrscher
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Toccata and Fugue in D Minor, BWV 565: I. Toccata
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Toccata and Fugue in D Minor, BWV 565: II. Fugue
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Orchestral Suite No. 4 in D Major, BWV 1069: I. Ouverture
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Harpsichord Concerto No. 5 in F Minor, BWV 1056: II. Largo
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Violin Partita No. 2 in D Minor, BWV 1004: V. Ciaccona
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Cello Suite No. 1 in G Major, BWV 1007: I. Prelude
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Notenbüchlein für Anna Magdalena Bach: XXIV. Bist du bei mir, BWV 508 (Arr. J.S. Bach)
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Partita No. 1 in B-Flat Major, BWV 825: I. Prelude
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Violin Concerto in A Minor, BWV 1041: II. Andante
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Chromatic Fantasy and Fugue in D Minor, BWV 903: I. Fantasie
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Wie schön leuchtet der Morgenstern, BWV 1: I. Coro. Wie schön leuchtet der Morgenstern
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Herz und Mund und Tat und Leben, BWV 147, Pt. 2: X. Coro. Jesu bleibet meine Freude
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Concerto in D Minor for Two Violins, BWV 1043: II. Largo ma non tanto
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Wachet! Betet! Betet! Wachet!, BWV 70, Pt. 1: I. Coro. Wachet! Betet! Betet! Wachet!
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Mass in B Minor, BWV 232, Pt. 1: VIII. Duet. Domine Deus (Soprano, Tenor)
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Harpsichord Concerto No. 3 in D Major, BWV 1054: II. Adagio e piano sempre
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Matthäus-Passion, BWV 244, Pt. 1: VIII. Aria. Blute nur, du liebes Herz! (Soprano)
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Matthäus-Passion, BWV 244, Pt. 2: XX. Aria. Aus Liebe will mein Heiland sterben (Soprano)
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Italian Concerto in F Major, BWV 971: I. Allegro
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Orpheus: Act I, Scene 2, "Angenehmer Aufenthalt" (Duetto Orpheus, Eurimedes)
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Orpheus: Act I, Scene 10, "C'est ma plus chère envie" (Aria: Orasia)
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Christmas Festive Concert - Bach, J.S. / Handel, G.F. / Praetorius, M. / Manfredini, F.O. / Mendelssohn, Felix / Gabrieli, G.
Handel, G.F.: Solo Cantatas / Opera Arias
Vocal Music (Sacred) - Tunder, F. / Buxtehude, D. / Rosenmuller, J. / Bach, J.M. / Franck, J.W.
Musical Table Entertainment - Reusner, E. / Brade, W. / Praetorius, B. / Eccard, J. / Zangius, N.
L'Incoronazione di Poppea, SV 308, Act I: scene 11
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L'Incoronazione di Poppea, SV 308, Act I: scene 1
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L'Incoronazione di Poppea, SV 308, Act I: scene 5
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L'incoronazione di Poppea, SV 308, Act III Scene 7: "Addio Roma" (Ottavia)
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L'Incoronazione di Poppea, SV 308, Act III, Scene 8: Duo: "Pur ti miro" (Poppea, Nerone)
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L'Incoronazione di Poppea, SV 308, Act I: scene 2
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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
Mass in B Minor, BWV 232: Christe eleison
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Mass in B Minor, BWV 232: Et in unum Dominum
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Mass in B Minor, BWV 232: Cum sancti spiritu
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MOZART, W.A.: Apollo et Hyacinthus / Bastien und Bastienne (Opera) [Pommer]
Telemann: Der Tag des Gerichts (The Day of Judgements)
Telemann, G.P.: Herr Ist Konig (Der) / Donnerode
George Frideric Handel: Essential Vocal Works
Classic Moods - Humperdinck, E. / Faure, G. / Brahms, J. / Schumann, R. / Puccini, G. / Grieg, E. / Schubert, F. / Puccini, G. / Rheinberger, J.G.
Waldscenen, Op. 82: Waldszenen, Op. 82: No. 3. Einsame Blumen (Solitary Flowers)
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Trio Sonata for Flute and Violin in D Major, RV 84: I. Allegro
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Concerto for Flute and 2 Violins in G Major, RV 102: II. Adagio
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Concerto for Flute and 2 Violins in G Major, RV 102: III. Vivace
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Concerto for Flute and 2 Violins in G Major, RV 102: IV. Arietta
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Concerto for Flute and 2 Violins in D Major, RV 89: I. Allegro assai
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Concerto for Flute and 2 Violins in D Major, RV 89: II. Cantabile – Andante e poco vivace
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Brandenburg Concerto No. 6 In B-Flat Major, BWV 1051: 3. Allegro
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Brandenburg Concerto No. 4 In G Major, BWV 1049: 1. Allegro
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Brandenburg Concerto No. 4 In G Major, BWV 1049: 2. Andante
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Brandenburg Concerto No. 4 In G Major, BWV 1049: 3. Presto
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Brandenburg Concerto No. 2 in F Major, BWV 1047: I. (Allegro)
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Brandenburg Concerto No. 2 in F Major, BWV 1047: II. Andante
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Brandenburg Concerto No. 1 in F Major, BWV 1046: I. (Allegro)
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Brandenburg Concerto No. 1 in F Major, BWV 1046: II. Adagio
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Brandenburg Concerto No. 1 in F Major, BWV 1046: III. Allegro
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Brandenburg Concerto No. 1 in F Major, BWV 1046: IV. Menuet - V. Trio - VI. Polonaise - VII. Trio
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Musical Offering, BWV 1079: 4b. Canon 2 a 2 violini in unisono
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Musical Offering, BWV 1079: 4d. Canon 4 a 2 per augmentationem, contrario motu
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Musical Offering, BWV 1079: 4g. Canon perpetuus super thema regium
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Musical Offering, BWV 1079: Sonata a 3 - III Andante
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Musical Offering, BWV 1079: Sonata a 3 - IV Allegro
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O du fröhliche (O Sanctissima): O du frohliche [O Sanctissima]
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Tauet Himmel den Gerechten: Trauet Himmel den Gerechten
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Judas Maccabaeus, HWV 63: Judas Maccabaeus, HWV 63: Tochter Zion, freue dich (Sung in German) [Sung in German]
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