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. 62-15 (H. 105) 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 a unique style that marks the transition to the Classical period. The first movement features a powerful theme and contrasting episodes that alternate, creating a dynamic development that captivates the audience. The second movement possesses a calm and introspective atmosphere, expressing deep emotions. The final third movement is characterized by a lively and rhythmic motion. This sonata highlights Emanuel Bachʼs innovative use of harmony and rhythm, demonstrating the emotional depth and technical sophistication of his music. For performers, it is a challenging piece that demands both expressiveness and technical skill.