His most important works were the Missa hispanica, which he exchanged for his diploma at Stockholm, a Mass in D minor, a Lauda Sion, a set of graduals, forty-two of which are reprinted in Diabelli's Ecclesiasticon, three symphonies (1785), and a string quintet in C major which has been erroneously attributed to Joseph Haydn.
The second and fifth symphonies are brilliant, and the fourth symphony is also pretty good.
Now, such subtleties seem as if they must be unconscious on the part of the composer; yet here Bach is so far aware of his reasons that his vivace e allegro is an arrangement of the second chorus of a church cantata, Gott man lobet dich in der Stille; and in the cantata the chorus has introductory and final symphonies and a middle section with a da capo!
The lessons, which were not very successful, lasted for about a year, and were then interrupted by Haydn's second visit to England (January 1794 to July 1795), where he produced the last six of his " Salomon " symphonies.
In 1764, while visiting England, he composed several sonatas for violin and harpsichord and a number of symphonies.