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 A Major Wq. 54/6 (H. 207) is a work that showcases his unique musical style. The first movement begins with lively and energetic motion, possessing a compelling strength that draws in the audience. The following second movement is characterized by a calm and emotionally rich melody, with profound expressiveness. The final movement, Allegretto, is notable for its light and rhythmic development, bringing the piece to a bright conclusion. This sonata demonstrates Bachʼs creativity and technical skill, allowing one to enjoy the diverse expressions inherent in his music.