4 orchestral suites. (The symphony in F in the same volume of the B. G. is only an earlier version of the first Brandenburg concerto.)
B. Chamber Music
3 sonatas for clavier and flute; a suite and 6 sonatas for clavier and violin, 3 for clavier and viola da gamba; 2 trios with figured bass; 2 flute-sonatas and a violin suite with figured bass; 6 sonatas (i.e. 3 sonatas and 3 partitas) for violin alone; 6 suites for violoncello alone.
C. Clavier and Organ Music
Bach's own collections are:—
1. Das wohltemperirte Klavier for clavichord: two books each containing 24 preludes and fugues, one in each major and minor key; with the object of stimulating tuning by "equal temperament" instead of sacrificing the euphony of remoter keys to that of the more usual ones.
2. Klavier-Übung (chiefly for harpsichord) in four books comprising: (i.) 15 two-part inventions and 15 three-part symphonies, (ii.) 6 partitas, (iii.) The "Goldberg" variations. 4 duets, and an important collection of organ choral-preludes, with the "St Anne" prelude and fugue in E flat, (iv.) The Italian concerto and French overture.
3. The 6 "French" and 6 "English" suites.
The other clavier works fill two Jahrgänge of the B.-G.
Bach's collections of organ music are (besides that included in the third part of the Klavier-Übung):—(1) 6 sonatas. (2) 4 groups of 6 organ preludes and fugues. (3) Das Orgelbüchlein, a collection of short choral-preludes carefully planned—all the blank pages of the autograph being headed with the titles of the chorales intended for them—but not half executed. (The projected whole would have been a larger volume than the Wohltemperirtes Klavier). (4) 18 larger chorale-preludes, including Bach's last composition. (5) The 6 "Schübler" chorales, all arranged from movements of cantatas.