and bass (1812, 2 settings; 2nd setting is a fragment) D 35, Composition exercises on "Serbate, o Dei custodi" ['Serbate, o Dei custodi'] for various vocal ensembles (1812, 3 settings; No. 1 Quartet for soprano, alto tenor and bass; No. 2 Choir for mixed voices; No. 3 Solo for tenor) D 37A, Four fugal sketches for unspecified instruments "Vier Fugentwürfe" [formerly D 967] (1813?, piano sketches; the Deutsch catalogue and the NSA incorrectly identify this as a work for piano) D 619, Vocal exercises for two voices and figured bass "Singübungen" (1818, figured bass usually realized for piano) D 965B, Fugal exercises for unspecified instruments/voices "Fugenübungen" (1828; eighteen fugal expositions for two voices) D Anh. I,32, Composition exercises "Generalbaßübungen" for unspecified instruments/voices [formerly D 598A] (date unknown) D deest, Canon ["?"] ['?'] in C major for five voices (1826?) D deest, Imitation exercises in invertible counterpoint for unspecified instruments/voices (1828, sketches; three 2-part imitation exercises) Works, fragments and sketches of unknown genre D 988A, Accompaniment part in B major for piano (after 1820, fragment; for a multi-part vocal composition?) D deest, Sketch of a composition "?" ['?'] for unspecified voices and orchestra (1811?, sketch) D deest, Aria "?" ['?'] for bass and piano (?) (1812, sketch; also appears as "Allegretto in D major") D deest, Theme of a dance composition (?) for piano (?) (1812?, sketch) D deest, Fragment of a composition for violin (?) (1813, sketch; fragment) D deest, Fragment of an instrumental composition for violin, viola and guitar (?) (1813?, fragment) D deest, Sketch of a composition for unspecified instrument(s) (1813, sketch) D deest, Piano piece (?) in F major (1813, sketch) D deest, Vocal composition "?" ['?'] for mixed choir (?) (1818?, fragment without text) D deest, Sketch of a theme for unspecified instruments/voices "Themenentwurf" (1818, sketch) D deest, Sketch of a theme in A minor for unspecified instruments/voices "Themenentwurf" (1818, sketch) D deest, Vocal composition "?" ['?'] for unspecified voices (1821?, fragment) D deest, Accompaniment for a vocal composition "?" ['?'] (1821?, fragment) D deest, Sketch of a composition for orchestra (?) (1823, piano sketch) D deest, Fragment of a composition for unspecified instruments (1823, sketch) D deest, Fragment of a cantata (?) "?" ['?'] for unspecified soloists, choir and orchestra (date unknown, fragment without text) D deest, Song (?) "...doch stärker ist die Mutterliebe" ['?'] for voice (?) and orchestra (date unknown, fragment; lost) D