This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
C. P. E. Bachʼs Württemberg Sonata No. 5 in E-flat major, Wq. 49-5 (H. 34), is a work characterized by the brightness and majesty of E-flat major, and is part of a set of six sonatas dedicated to Duke Carl Eugen of Württemberg in 1744. The first movement stands out with its lively tempo and refined sonata form, marked by clear melodies and rich harmonies. The second movement is meditative and deeply emotional, heavily influenced by the empfindsamer Stil, and its delicate nuances are particularly highlighted when performed on the clavichord. The third movement, Allegro assai, is a lively finale with a fast tempo, incorporating dance-like elements. While this sonata is suitable for performance on the harpsichord or fortepiano, the clavichord is especially effective in expressing subtle dynamics, enhancing the introspective aspects of the piece. This sonata, with its balance of formal beauty and emotional expression, symbolizes the diversity of C. P. E. Bachʼs keyboard music.