This site introduces unknown composer Emanuel Bach (C. P. E. Bach). This English version was translated from Japanese one by ChatGPT.
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.