This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Sonatina in D minor Wq. 63-12 (H. 297) is one of the works that showcases his unique musical style. This sonatina reflects his innovative approach during the transitional period from the Baroque to the Classical era. The key of D minor creates an emotional and dramatic atmosphere, leaving a deep impression on the audience. The piece, while influenced by his father Johann Sebastian Bach, pursues a freer and more expressive form. Notably, unexpected modulations and rhythmic changes are characteristic, drawing listeners in. Emanuel Bachʼs works significantly influenced the development of later Classical music, and this sonatina is regarded as an important example of that influence.