This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Allegro in B-flat Major Wq. 116-38 (H. 312) is a work that richly expresses the changes of emotion within his keyboard music. The piece begins with a bright and lively opening, possessing an energy that captivates the listener. Rhythmic passages and flowing melodies alternate, evoking a variety of emotions in the audience. Bachʼs unique harmonic progressions and unexpected modulations bring tension and excitement to the music. The inclusion of ornamentation and improvisational elements presents a technical challenge for the performer. Overall, the piece exhibits an expressiveness that transcends the boundaries of the Classical era.