This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Prussian Sonata No. 4 in C minor, Wq. 48-4 (H. 27), is particularly noteworthy as a rare minor key work within the collection of sonatas dedicated to King Frederick II of Prussia in 1742. The first movement begins with a powerful theme, characterized by tension and dramatic development. This movement employs contrapuntal techniques, imparting a sense of gravity. The second movement possesses a serene and sentimental character, with the lyricism of the melody and the richness of the harmony standing out. In this movement, the delicacy of the ornamentation adds depth to the music. The third movement progresses at a fast tempo, serving as an energetic and dynamic finale. The choice of the key of C minor allows for a wide range of emotional expression by Bach, showcasing the unique beauty inherent in minor key compositions. This sonata is an excellent example of the empfindsamer Stil, combining formal perfection with emotional depth.