This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Sonata in C Minor Wq. 60 (H. 209) is one of the works that showcases his unique musical style. This sonata is characterized by its depth of emotion and expressive melodies, which have the power to captivate the listener. The first movement stands out with its tension and dramatic elements, reflecting the transition in music from the Baroque to the Classical period. The improvisational elements and bold harmonic progressions found in his works are prominently displayed in this sonata as well. Particularly, the unexpected modulations and rhythmic changes provide a fresh surprise to the audience. Throughout the piece, Emanuel Bachʼs creativity and technical prowess shine brightly.