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 E minor Wq. 65/5 (H. 13) 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 indicates a transition to the Classical period. The first movement begins with a powerful and dramatic theme, reflecting Emanuel Bachʼs characteristic emotional fluctuations. The following second movement, Andante (early version), possesses a calm and introspective atmosphere, deeply moving the listener. The final third movement, Allegro di molto, is a lively finale brimming with technical skill and energy. This sonata demonstrates Emanuel Bachʼs innovative musical language and is an important work for understanding the evolution of music in his era. His compositions, with their rich emotional expression and clever structure, greatly influenced later composers.