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. 65/31 (H. 121) is one of the most emotionally rich and innovative works in his keyboard music. This sonata, while influenced by his father Johann Sebastian Bach, also exhibits characteristics that mark the transition to Classical music. The first movement begins with a powerful and majestic tempo, highlighting dramatic expression. The following second movement is characterized by a calm and graceful melody, evoking a sense of emotional depth. The final third movement is notable for its lively and playful rhythm, bringing a vibrant conclusion to the piece. This sonata not only demonstrates Emanuel Bachʼs unique style but also reflects the evolution of music in his era, presenting a technically and expressively rich challenge for performers.