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 C Major Wq. 116-51 (H. 325) is a work full of vibrant energy within his keyboard music. This piece takes advantage of the bright and cheerful key of C major, characterized by its lively rhythm and flowing melody. Reflecting his style during the transition from the Baroque to the Classical period, it richly employs ornamentation and improvisational elements. The changes in dynamics and unexpected modulations captivate the listener, offering technical challenges to the performer. Overall, it is a piece that brings joy and surprise to the audience.