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 C minor Wq. 64-6 (H. 12) is a work with a unique expressiveness among his keyboard music. This sonatina is rich in emotional fluctuations, reflecting the musical changes during the transition from the Baroque to the Classical period. From the outset, a tense melody unfolds, captivating the listener. In the middle section, contrastingly calm passages appear, adding diversity to the overall structure. Bachʼs skillful harmonic progressions and rhythmic changes add depth to the piece. Performers are required to have not only technical skills but also the ability to express emotions richly. This sonatina is an example of Emanuel Bachʼs musical curiosity and creativity.