Carl Philipp Emanuel Bach - Sonata in A Minor for Solo Flute. Carl Philipp Emanuel Bach composed his Sonata in A Minor in Berlin in 1747, during his employment as harpsichordist at the court of Frederick the Great of Prussia. The work is particularly significant as Bach’s only composition for unaccompanied flute and was published in 1763 in the Berlin musical periodical Musikalisches Mancherley, making it the only one of his flute sonatas published during his lifetime. In three movements: Poco Adagio, Allegro, and Allegro.