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 Major Wq. 62/13 (H. 67) is one of the particularly captivating works among his keyboard music. This sonata demonstrates his unique expressiveness and emotional richness. The first movement has a lively and bright atmosphere, captivating the listener. The following second movement possesses a calm and introspective character, expressing deep emotions. The final third movement is a vibrant and energetic finale, showcasing Bachʼs technical prowess and creativity. This sonata is an excellent example of his innovative style during the transition to the Classical period, reflecting the influence his music had on later composers.
This Sonata in D Major is notable for having particularly short movements among the sonatas included in this volume. The opening ʼAllegrettoʼ is a graceful movement where Bach once again treats repeated notes as a primary melodic element. The middle movement is even shorter, with alternating repeated notes and other melodic and rhythmic gestures creating a recitative-like effect. This movement primarily serves a transitional role, beginning in G major and ending in A major, the dominant key of the next movement. The final movement ʼAllegroʼ proceeds at the tempo of a fast minuet, with each main section ending in a long ʼsighʼ."
For an overview of Wq. 62 as a whole, see the commentary on "Sonata Collection Wq. 62".