Book IV. Cothen, 1717-1723 : I. Arrival at Cothen, death of Bach's first wife and journey to Hamburg in 1720, Reinken, Bach and Handel as organ-players --
II. Bach's clavier music, toccatas, his reform in fingering, adjustment of pitch, invention of the pianoforte, Bach as a teacher, the clavier-buchlein, inventionen und sinfonien --
III. Bach as a violinist, the suite and the sonata, works for violin, violoncello, flute, etc. --
IV. Bach's second marriage, change of posts, the French suites, the Wolhtemperirte Clavier

Book V. Leipzig, 1723-1734 : I. Bach's appointment and installation as cantor at Leipzig --
II. The Thomasschule, duties of the cantor, state of music in Leipzig --
III. Bach's official duties as cantor, his dispute with the town council, and endeavours to improve the condition of the music, his letter to Erdmann, Gesner's appointment as rector of the school --
IV. The plan and arrangement of the church services in Leipzig, music used in it; the organs and Bach's treatment of accompaniments, difficulties of pitch and tune --
V. Kuhnau, the church cantata, texts by Neumeister and Picander, comparison of their merits, Bach's church cantatas, the "Magnificat" --
VI. Bach's cantatas (continued) --
VII. Passion music before Bach, the St. John Passion, the St. Matthew Passion --
VIII. Bach's compositions for Christmas, Easter, and Ascension --
IX. Bach's motets --
X. "Occasional" compositions.

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