This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Rondo in D minor Wq. 61-04 (H. 290) is one of his later works, distinguished by its emotional depth and expressiveness. This piece employs the rondo form, where the main theme returns repeatedly, leaving a strong impression on the audience. The melancholic melody at the beginning reflects Bachʼs unique sensitivity and has the power to captivate listeners. In the middle section, contrasting bright passages appear, bringing variation to the overall structure. Bachʼs skillful harmonic progressions and rhythmic changes give the piece a rich expressiveness. Performers are required to have a delicate touch and control of dynamics, making it a technically challenging work. This rondo serves as an important example of Bachʼs musical exploration and innovation.