before December 23, 1768. BR-JCFB B 11 \ Trio for 2 violins & b.c. in A major (Wf VII/2) BR-JCFB B 12 \ Trio for 2 violins & b.c. in F major (Wf VII/3) BR-JCFB B 13 \ Trio for 2 violins & b.c. (lost) BR-JCFB B 14 \ Trio for keyboard and violin/flute in E-flat major (Wf VIII/2) Six Sonatas for Keyboard and flute (violin) - one of the most widely performed work by composer - published 1777 BR-JCFB B 15 \ Flute Sonata No. 1 in D minor (Wf VIII/3.1) BR-JCFB B 16 \ Flute Sonata No. 2 in D major (Wf VIII/3.2) - two versions 16a and 16b. BR-JCFB B 17 \ Flute Sonata No. 3 in C major (Wf VIII/3.3) BR-JCFB B 18 \ Flute Sonata No. 4 in C major (Wf VIII/3.4) - two versions 18a and 18b. BR-JCFB B 19 \ Flute Sonata No. 5 in A major (Wf VIII/3.5) BR-JCFB B 20 \ Flute Sonata No. 6 in C major (Wf VIII/3.6) versions 16b and 18b were versions made after the published collection, meaning that 16a and 18a are those found in the collection Two Sonatas for keyboard and violin from Musikalische Nebenstunden BR-JCFB B 21 \ Sonata in G major (Wf IX/2) BR-JCFB B 22 \ Sonata in D major (Wf IX/3) BR-JCFB B 23 - 24 \ 2 Flute Sonatas (lost) Three Sonatas for keyboard and flute (violin) - composed around 1770/80 BR-JCFB B 25 \ Sonata in F major (Wf VIII/1) BR-JCFB B 26 \ Violin Sonata in F major (incomplete) BR-JCFB B 27 \ Violin Sonata in D major (incomplete) BR-JCFB B 28 \ Sonata for Keyboard and Violin in G major (Wf IX/1) (lost) BR-JCFB B 29a \ Sonata for keyboard and flute/violin in D major (Wf VII/4) BR-JCFB B 29b \ Sonata for Harpsichord concertato and flute/violin and Violoncello in D major (Wf VII/4) - later version Six Sonatas with keyboard - composed around 1780 not before 1777 - for Keyboard, Flute, Violin and Viola BR-JCFB B 30 \ Sonata No. 1 (lost) BR-JCFB B 31 \ Sonata No. 2 in G major (Wf VII/5) BR-JCFB B 32 \ Sonata No. 3 in A major (Wf VII/6) BR-JCFB B 33 \ Sonata No. 4 (lost) BR-JCFB B 34 \ Sonata No. 5 in C major (Wf VII/7) BR-JCFB B 35 \ Sonata No. 6 (lost) BR-JCFB B