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description: Tanja Tetzlaff (born 1973) is a German cellist. She played first as an orchestra member, but then as a soloist, a founding member of the Tetzlaff Quartet, a string quartet led by her brother Christian
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  track: Octet in E-Flat Major, Op. 20, MWV R20: IV. Presto - Live
  track: Octet in C Major, Op. 7: I. Très modéré - Live
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Octet in E-Flat Major, Op. 20, MWV R20: III. Scherzo (Allegro leggierissimo) - Live
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Serenade for Clarinet Quartet in B Major, Op. 4: I. Moderato
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Serenade for Clarinet Quartet in B Major, Op. 4: III. Allegro molto
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Serenade for Clarinet Quartet in B Major, Op. 4: IV. Langsamer
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Serenade for Clarinet Quartet in B Major, Op. 4: VI. Allegro vivace
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Clarinet Quartet: I. Notturno. Adagio
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Clarinet Quartet: III. Serenade. Tempo di Valse
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Double Concerto in A Minor, Op. 102: I. Allegro
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Double Concerto in A Minor, Op. 102: II. Andante
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Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: I. Allegro moderato
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Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: II. Andante un poco mosso
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Piano Trio No. 1 in B-Flat Major, Op. 99, D. 898: III. Scherzo. Allegro - Trio
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Piano Trio No. 2 in E-Flat Major, Op. 100, D. 929: III. Scherzando. Allegro moderato
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Piano Trio in E-Flat Major, Op. 148, D. 897 "Notturno"
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Piano Trio No. 3 in F Minor, Op. 65, B. 130: I. Allegro ma non troppo
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Piano Trio No. 3 in F Minor, Op. 65, B. 130: II. Allegretto grazioso
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Piano Trio No. 3 in F Minor, Op. 65, B. 130: III. Poco adagio - Meno mosso
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: I. Lento maestoso - Allegro quasi doppio movimento
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: III. Andante - Vivace non troppo
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: IV. Andante moderato - Allegretto scherzando
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Piano Trio No. 4 in E Minor, Op. 90, B. 166: VI. Lento maestoso - Vivace
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Triple Concerto for Violin, Cello & Piano in C Major, Op. 56: II. Largo
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Triple Concerto for Violin, Cello & Piano in C Major, Op. 56: I. Allegro
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Piano Trio No. 1 in B Major, Op. 8 (Revised 1889 Version): I. Allegro con brio
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Piano Trio No. 2 in C Major, Op. 87: II. Andante con moto
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Piano Trio No. 3 in C Minor, Op. 101: I. Allegro energico
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Piano Trio No. 3 in C Minor, Op. 101: III. Andante grazioso
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Schumann: Piano Trio No. 1 in D Minor, Op. 63: IV. Mit Feuer
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 1, Nicht schnell
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Schumann: Piano Trio No. 1 in D Minor, Op. 63: I. Mit Energie und Leidenschaft
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Schumann: Piano Trio No. 3 in G Minor, Op. 110: I. Bewegt, doch nicht zu rasch
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Schumann: Piano Trio No. 3 in G Minor, Op. 110: II. Ziemlich langsam
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Schumann: Piano Trio No. 2 in F Major, Op. 80: II. Mit innigem Ausdruck - Lebhaft
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Schumann: Fantasiestücke, Op. 88: No. 2, Humoreske
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 2, Mit innigem Ausdruck
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 3, Andantino
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 5, Nicht zu schnell
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 6, Adagio
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Piano Trio No. 2 in E-Flat Major, D. 929: III. Allegro moderato
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String Quintet in C Major, D. 956: I. Allegro ma non troppo
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String Quintet in C Major, D. 956: II. Adagio
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Piano Quartet No. 3 in C Minor, Op. 60: II. Scherzo. Allegro
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Piano Quartet No. 2 in A Major, Op. 26: I. Allegro non troppo
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Piano Quartet No. 2 in A Major, Op. 26: II. Poco Adagio
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Piano Quartet No. 2 in A Major, Op. 26: III. Scherzo. Poco Allegro
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Piano Quartet No. 3 in C Minor, Op. 60: III. Andante
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Piano Quartet No. 2 in A Major, Op. 26: IV. Finale. Allegro
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  date published: 2026-07-30T07:28:30Z
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Piano Quartet No. 3 in C Minor, Op. 60: IV. Allegro comodo
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audio: Piano Quartet No. 3 in C Minor, Op. 60: IV. Allegro comodo
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Dreigroschenoper: Mackie Messer - Arr. für Saxophon, Streichquartett und Klavier
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  date published: 2026-07-02T03:55:08Z
audio: Dreigroschenoper: Mackie Messer - Arr. für Saxophon, Streichquartett und Klavier
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Dreigroschenoper: Zuhälterballade - Arr. für Saxophon, Streichquartett und Klavier
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  date published: 2026-07-02T03:55:08Z
audio: Dreigroschenoper: Zuhälterballade - Arr. für Saxophon, Streichquartett und Klavier
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OTSTimestamp
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OpenTimestamps Proof of Existence
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date published: 2026-07-08T03:22:41Z

Octet in E-Flat Major, Op. 20, MWV R20: II. Andante - Live
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Octet in E-Flat Major, Op. 20, MWV R20: IV. Presto - Live
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by artist: Quirine Viersen
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  date published: 2026-07-08T03:53:27Z
audio: Octet in E-Flat Major, Op. 20, MWV R20: IV. Presto - Live
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Octet in C Major, Op. 7: I. Très modéré - Live
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audio: Octet in C Major, Op. 7: I. Très modéré - Live
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Octet in C Major, Op. 7: II. Très fougueux - Live
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Octet in C Major, Op. 7: III. Lentement - Live
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Octet in C Major, Op. 7: IV. Mouvement de valse bien rythmée - Live
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track: Serenade for Clarinet, Violin and Cello, Op. 93: II. Burletta. Vivace ma non troppo
track: Serenade for Clarinet, Violin and Cello, Op. 93: III. Intermezzo. Andantino
track: Serenade for Clarinet, Violin and Cello, Op. 93: IV. Giocoso. Allegro molto moderato
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track: Serenade for Clarinet Quartet in B Major, Op. 4: III. Allegro molto
track: Serenade for Clarinet Quartet in B Major, Op. 4: IV. Langsamer
track: Serenade for Clarinet Quartet in B Major, Op. 4: VI. Allegro vivace
track: Clarinet Quartet: I. Notturno. Adagio
track: Clarinet Quartet: III. Serenade. Tempo di Valse

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Serenade for Clarinet, Violin and Cello, Op. 93: III. Intermezzo. Andantino
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Serenade for Clarinet, Violin and Cello, Op. 93: IV. Giocoso. Allegro molto moderato
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track: From the Bohemian Forest, Op. 68, B. 133: No. 5, Silent Woods
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track: Double Concerto in A Minor, Op. 102: I. Allegro
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Schubert: Chamber Works
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track: Piano Trio No. 3 in F Minor, Op. 65, B. 130: I. Allegro ma non troppo
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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audio: Schumann: Piano Trio No. 3 in G Minor, Op. 110: IV. Kräftig, mit Humor
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Schumann: Piano Trio No. 2 in F Major, Op. 80: I. Sehr lebhaft
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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Schumann: Fantasiestücke, Op. 88: No. 1, Romanze
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: Schumann: Fantasiestücke, Op. 88: No. 1, Romanze
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Schumann: Piano Trio No. 2 in F Major, Op. 80: III. In mässiger Bewegung
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Schumann: Piano Trio No. 2 in F Major, Op. 80: III. In mässiger Bewegung
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Schumann: Fantasiestücke, Op. 88: No. 3, Duett
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: Schumann: Fantasiestücke, Op. 88: No. 3, Duett
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Schumann: Piano Trio No. 2 in F Major, Op. 80: IV. Nicht zu rasch
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: Schumann: Piano Trio No. 2 in F Major, Op. 80: IV. Nicht zu rasch
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Schumann: 6 Studien in kanonischer Form, Op. 56: No. 4, Innig
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
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Sibelius & Schoenberg: String Quartets
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Johann Sebastian Bach: Brandenburg Concerto No. 6 - Viola da Gamba Sonata - Trio Sonata - Violin Sonata in F Minor (Live)
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date published: 2009-08-17

Malinconia: Works for Cello & Piano: Sibelius & Grieg & Rachmaninov
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Haydn: Cello Concertos
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OTSVerifyInstructions
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value: 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

OpenTimestamps Proof of Existence
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Schwanengesang, D. 957: No. 3, Frühlingssehnsucht
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String Quintet in C Major, D. 956: IV. Allegretto - Più allegro
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by artist: Tanja Tetzlaff
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
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Schwanengesang, D. 957: No. 1, Liebesbotschaft
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:53:27Z
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Schwanengesang, D. 744
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Schwanengesang, D. 744
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Schwanengesang, D. 957: No. 8, Der Atlas
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Schwanengesang, D. 957: No. 8, Der Atlas
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The Essential Dvořák
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Brahms: Piano Quartets Nos. 2 & 3
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-08T03:22:41Z
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track: Piano Quartet No. 3 in C Minor, Op. 60: II. Scherzo. Allegro
track: Piano Quartet No. 2 in A Major, Op. 26: I. Allegro non troppo
track: Piano Quartet No. 2 in A Major, Op. 26: II. Poco Adagio
track: Piano Quartet No. 2 in A Major, Op. 26: III. Scherzo. Poco Allegro
track: Piano Quartet No. 3 in C Minor, Op. 60: III. Andante
track: Piano Quartet No. 2 in A Major, Op. 26: IV. Finale. Allegro
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Jonny
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track: Dreigroschenoper: Mackie Messer - Arr. für Saxophon, Streichquartett und Klavier
track: Dreigroschenoper: Zuhälterballade - Arr. für Saxophon, Streichquartett und Klavier

The Essential Schubert
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No Music on a Dead Planet
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