This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Carl Philipp Emanuel Bachʼs Sonata in B-flat Major Wq. 65/44 (H. 211) is one of the particularly captivating works among his keyboard music. This sonata demonstrates his unique expressiveness and emotional richness. The first movement, Andantino, possesses a calm and graceful atmosphere, making the listener feel at ease. The following second movement, Allegro assai, is a lively and energetic movement that highlights Bachʼs technical prowess and creativity. This sonata reflects his innovative style during the transitional period to classical music, establishing his own musical voice while being influenced by his father, Johann Sebastian Bach. Emanuel Bachʼs works are characterized by a rich emotional expression and structural balance, and this sonata is no exception.