This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Sonata in B-flat Major Wq. 54/4 (H. 206) is a captivating work that showcases his unique musical style. The first movement is characterized by a light and graceful melody, inviting the listener into a pleasant atmosphere. The following second movement incorporates the rhythm of a Sicilian dance, offering a gentle and flowing section with emotionally rich expression. The final third movement is lively and fast-paced, featuring technical passages that challenge the performerʼs skill. This sonata demonstrates Bachʼs creativity and the breadth of his emotional expression, allowing one to enjoy the diversity inherent in his music.