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 B-flat Major Wq. 65-09 (H. 18) is one of the particularly captivating works among his keyboard music. This sonata consists of three movements, each expressing different emotions and styles. The first movement is characterized by a calm and graceful melody, creating a soothing atmosphere for the listener. The following second movement delves into deeper emotions, presenting introspective and sentimental music. The final third movement is a lively and energetic finale, featuring impressive technical passages. This sonata exemplifies Emanuel Bachʼs unique expressiveness and serves as a bridge to classical music, embodying his innovative musical style.