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 D minor Wq. 65-03 (H. 5) is one of the most emotionally rich and expressive works among his keyboard music. This sonata, while influenced by his father Johann Sebastian Bach, showcases his unique style during the transition to the Classical period. The first movement, "Allegro di molto," begins with a powerful and passionate theme, characterized by dramatic development. The following second movement, "Andante," possesses a calm and introspective atmosphere, expressing deep emotions. The final third movement, "Allegro assai," is a lively finale, marked by virtuosic passages and rhythmic energy. This sonata embodies Emanuel Bachʼs richness of emotional expression and the musical innovations of his time, making it particularly popular among his works. For performers, it offers a piece that presents both technical challenges and opportunities to convey emotional depth.