This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Polonaise in F Major Wq. 116-41 (H. 315) is a work that shines with his unique expressiveness and creativity. This polonaise is characterized by its lively yet profound melody, captivating listeners. While it incorporates rhythmic dance elements, it skillfully weaves in the emotional fluctuations typical of Bach. Particularly notable are the harmonic changes and the use of ornamentation, which present a technical challenge for performers. Respecting the traditional form of the polonaise, his innovative approach is evident throughout, bringing a fresh breeze to 18th-century music.