Karl-Heinz Steffens (born 28 November 1961) is a German clarinetist and conductor. Biography Steffens studied clarinet from 1982 to 1985 at the State University of Music and Performing Arts Stuttgart
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 0x866ad89ba844c734ff2892dc8bca9cc8c7a2d961fa521937e5d38d8f2d99db8c. 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/16c8cc0b-92e9-4a2a-aac6-a3c9ec0ef0df.json and https://artists.proofprofile.net/proofs/artist/16c8cc0b-92e9-4a2a-aac6-a3c9ec0ef0df.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Dutilleux: Symphony No. 1, 2 Sonnets de Jean Cassou & Métaboles
Serenade for Strings in E Major, Op. 22: II. Tempo di Valse
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25878524aff0970cbdf91990f7f30b95a514c93b8a399bfb86b813c14f26d5b. 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/DEP629501824 — a six-check JSON result.
Serse, HWV 40: Ombra mai fu, "Largo" (Arr. for Orchetra)
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Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": I. Allegro
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Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": II. Romanze
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Le nozze di Figaro, K.492: Act II: Voi che sapete
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Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": III. Menuetto. Allegro - Trio
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Die Zauberflöte, K. 620: March of the Priests
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Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": IV. Rondo. Allegro
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Symphony No. 41 in C Major, K. 551, "Jupiter": I. Allegro vivace
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Die Zauberflöte: Dies Bildnis ist bezaubernd schön
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Symphony No. 41 in C Major, K. 551, "Jupiter": II. Andante cantabile
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Die Zauberflöte, K. 620: Ach, ich fühl's
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Symphony No. 41 in C Major, K. 551, "Jupiter": III. Menuetto: Allegretto
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Serenade No. 9 in D Major, K. 320 "Posthorn": II. Menuetto - Allegretto - Trio
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Symphony No. 41 in C Major, K. 551, "Jupiter": IV. Molto allegro
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Serenade No. 9 in D Major, K. 320 "Posthorn": III. Concertante - Andante grazioso
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Piano Concerto No. 21 in C Major, K. 467, "Elvira Madigan": II. Andante
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Serenade No. 9 in D Major, K. 320 "Posthorn": IV. Rondeau - Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bb4803a091c232170efbd36f2664f2bc730cdcc2af6f2437208dd361684c30. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USSM10311571 — a six-check JSON result.
Cosi Fan Tutte, Act I: "Un'aura Amorosa"
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Concerto in C Major for Flute, Harp and Orchestra, K. 299: II. Andantino
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96704c0c9fdf3acef9394d3c12d7f31e2cdb888fff52bc568d5dfb88e5e380c. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE470100297 — a six-check JSON result.
Concerto for Clarinet and Orchestra in A Major, K. 622: III. Rondo. Allegro
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Piano Sonata in A Major, K. 331: III. Alla turca. Allegretto
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Concerto No. 5 in A Major for Violin and Orchestra, K. 219 "Turkish": I. Allegro aperto
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Vesperae solennes de confessore, K.339: V. Laudate Dominum (Arranged for Violin & Orchestra by Joshua Bell)
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Piano Concerto No. 20 in D Minor, K. 466: II. Romance
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No Me Gusta la Música Clásica Pero Lo Que Hay Aquí Si. Especial Niños
Suite Bergamasque, L. 75 (Transcribed for Harp): III. Clair de lune
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Symphony No. 9 in E Minor, Op. 95, B. 178 "From The New World": Allegro con fuoco
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Mozart: Complete Edition Vol.12: Arias, Lieder etc
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb45f68a97324492671bb943c2e8f2dd9aa5d8b4d06c1c356b2375ae9fcdc37d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEF058104250 — a six-check JSON result.
Or che il dover... Tali e cotanti sono, K.36
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0c8f5474f9a4781a5dbee500f8c0c3224bd3b5d9a34c871f6223df7d330a40. 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/DEF058002580 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd18412d71bb0000295aa85181e7294dd50a2c91bfbd1885109cbd9a89a59c8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEF058104390 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11c00d0034d55ba290ec691484d47bf4d77074e55fa5a04cd94474f692dd3d3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLA508603833 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c64863f368ebff4fd0e67cb3fd221172056e89b76c3e5c0f4a143a73aed8ee. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/NLA508900310 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4c2b532ae473ceb68f94a451ba690bb3685a3b31b8798155cd10ee6fc255d9. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLA508603817 — a six-check JSON result.
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String Quartet in F Major, Op. 3, No. 5, Hob. III:17: II. Andante cantabile
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Suite for Orchestra No. 4 in D Major, BWV 1069: Menuett I & II
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Suite No. 3 in D Major, BWV 1068: II. Air (Arr. for Piano Solo)
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Thaïs: Méditation (Arr. for Cello and Piano)
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Concerto for Clarinet and Orchestra in A Major, K. 622: II. Adagio
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Suite bergamasque, L. 75: III. Clair de lune (Arr. for Orchestra)
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String Quintet in E Major, Op. 11, No. 5, G. 275: III. Minuetto con un poco di moto - Trio
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Symphony No. 5 in C-Sharp Minor: IV. Adagietto - Excerpt
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Canon in D Major for Strings and Continuo
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Symphonic Etudes, Op. 13: Variation IV (Anhang)
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Piano Sonata No. 8 in C Minor, Op. 13, "Pathétique": II. Adagio cantabile
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Liebestraum No. 3 in A-Flat Major, Op. 62, No. 3, S. 541, No. 3
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Symphony No. 36 in C Major, K. 425 "Linz": II. Poco Adagio
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String Quartet No. 1 in D Major, Op. 11: II. Andante cantabile (Arr. for Cello and Orchestra)
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Symphony No. 9 in E Minor, Op. 95, "From the New World": II. Largo
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Kabalevsky: Pathétique Overture, Violin Concerto, Vesna & Colas Breugnon
Violin Concerto in C Major, Op. 48: I. Allegro molto e con brio
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Ginastera: Obertura para el Fausto Criollo, Op. 9, Variaciones Concertantes, Op. 23, Ollantay, Op. 17 & Bomarzo Suite, Op. 34a
Zimmermann: Alagoana, Sinfonie in einem Satz, Photoptosis & Stille und Umkehr
Bassoon Concerto in B-flat Major, K. 191/186E: I. Allegro
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Bassoon Concerto in B-flat Major, K. 191/186E: II. Andante ma adagio
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Weber: Clarinet Concertos Nos. 1 & 2 - Concertino
Brahms, J.: Piano Quartet No. 1 (Orch. A. Schoenberg) / Clarinet Sonata No. 1
Piano Quartet No. 1 in G Minor, Op. 25 (arr. A. Schoenberg): I. Allegro
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Piano Quartet No. 1 in G Minor, Op. 25 (arr. A. Schoenberg): II. Intermezzo: Allegro ma non troppo
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Piano Quartet No. 1 in G Minor, Op. 25 (arr. A. Schoenberg): III. Andante con moto
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Piano Quartet No. 1 in G Minor, Op. 25 (arr. A. Schoenberg): IV. Rondo alla Zingarese: Presto
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Clarinet Sonata No. 1 in F Minor, Op. 120 (orch. L. Berio): II. Andante un poco adagio
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Clarinet Sonata No. 1 in F Minor, Op. 120 (orch. L. Berio): III. Allegretto grazioso
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Clarinet Sonata No. 1 in F Minor, Op. 120 (orch. L. Berio): IV. Vivace
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Brahms, J.: Trio, Op. 114 / Clarinet Sonatas Nos. 1 and 2
Schumann, R.: 3 Romanzen, Op. 94 / Fantasiestucke / 5 Pieces in Folk Style / Myrthen
Mozart, W.A.: Clarinet Quintet, K. 581 / Excerpts From The Magic Flute and The Marriage of Figaro (Arr. for 2 Clarinets)
Tsfasman: Lyrical Waltz (from Jazz Suite)
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Rimsky-Korsakov: Andante mosso (from Piano Concerto in C-sharp Minor, Op. 30)
Piano Concerto in C-Sharp Minor, Op. 30: II. Andante mosso
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
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Suite for Orchestra No. 3 in D Major, BWV 1068: II. Air
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Serenade No. 13 in G Major, K. 525, "Eine kleine Nachtmusik": II. Romance. Andante
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Bagatelle in A Minor, WoO 59 "Für Elise"
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Cavalleria rusticana: Act I: Intermezzo sinfonico
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The Nutcracker, Op. 71, TH 14 (Extracts): Act II Scene 3, Waltz of the Flowers
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Humoresque in G-Flat Major, Op. 101, No. 7 (Arranged for Violin & Orchestra)
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Violin Concerto No. 1 in G Minor, Op. 26: II. Adagio
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Thaïs: Méditation (Arr. for Violin and Orchestra)
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Má vlast, JB 1:112: II. Vltava, "The Moldau"
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Also sprach Zarathustra, Op. 30: Sonnenaufgang
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Mandolin Concerto in C Major, RV 425: I. Allegro
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Requiem in D Minor, K. 626: III. Dies irae
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Carmina Burana: Fortuna imperatrix mundi: O Fortuna
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Piano Trio No. 2 in E-flat Major, D.929, Op. 100: II. Andante con moto
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Ständchen, D. 957, No. 4 (Arr. for Clarinet and Chamber Ensemble)
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Concerto for Clarinet and Orchestra No. 1 in F Minor, Op. 73: I. Allegro
Russische Kammerphilharmonie St. Petersburg
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Concerto for Clarinet and Orchestra No. 2 in E-Flat Major, Op. 74: II. Romanza. Andante con moto
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Sonata for Clarinet and Piano in E-Flat Major, Op. 120 No. 2: I. Allegro amabile
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Hungarian Dances, WoO 1: No. 14 in D Minor
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Fantasiestücke, Op. 73: I. Zart und mit Ausdruck
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Eight Pieces for Clarinet, Viola and Piano, Op. 83: I. Andante
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Eight Pieces for Clarinet, Viola and Piano, Op. 83: V. Andante, "Rumänische Melodie"
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Eight Pieces for Clarinet, Viola and Piano, Op. 83: VI. Andante con moto, "Nachtgesang"
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Mondnacht, Op. 39, No. 5 (Arr. for Clarinet and Chamber Ensemble)
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5 Stücke im Volkston, Op. 102: II. Langsam
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Piano Concerto No.23 in A Major, K. 488: II. Adagio
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Concerto No. 21 in C Major, K. 467: Andante
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Die Zauberflöte, K. 620: In diesen heil'gen Hallen
Württembergisches Kammerorchester Heilbronn
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Je n'aime pas le classique, mais adagio j'aime bien !
Peer Gynt Suite No. 1, Op. 46: Ase's Death
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Variations on an Original Theme, Op. 36 "Enigma": Variation 9 (Adagio), "Nimrod"
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Symphony No. 5 in E Minor, Op. 64: Andante cantabile, con alcuna licenza
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Symphony No. 5 in C-Sharp Minor: Adagietto: Sehr langsam
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La magie de l'Avent - Musique féérique pour Noël
Vesperae solennes de Confessore, KV 339: Laudate Dominum
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Dans une étable obscure: (Es ist ein Ros entsprungen)
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