This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Sonatina in G Major Wq. 97 (H. 450) is one of the particularly captivating works among his keyboard music. This sonatina, written in a bright and lively G major, offers a sense of familiarity to the listener. The piece is characterized by flowing melodies and rhythmic accompaniment, providing a technical challenge for the performer. The diversity of emotions in Bachʼs music is beautifully expressed in this sonatina. In particular, the contrast between rapid passages and calm sections offers the audience a rich musical experience. The improvisational elements common in his works are also felt, allowing for different expressions depending on the performerʼs interpretation. This sonatina is an excellent example of Emanuel Bachʼs creativity and technical prowess.
I. Andantino
II. Tempo di Minuetto
[This sonatina] serves as a window to new concert audiences. Like other sonatinas, the one introduced here is performed with a combination of keyboard and string ensemble, along with flute and horn, resembling Emanuel Bachʼs traditional solo concertos.
[This sonatina] consists of two movements in the same key, rather than three, both composed at a moderate tempo (neither very fast nor slow), making it an accessible piece. Furthermore, the emphasis on wind sounds in this sonatina is greater than in Emanuelʼs concertos, aiming to appeal to audiences with relatively less musical experience.
In the "Sonatina in G Major," the two movements are structured in a thematic recursive rondo form, with the first movement in particular presenting the theme as an arrangement of a short "piece" from another collection.