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 E minor Wq. 64-4 (H. 10) is a work that stands out for its unique emotional expression within his keyboard music. This sonatina blends the deep emotions inherent in the minor key with Bachʼs characteristic delicate expressiveness. The piece often includes unexpected modulations and rhythmic changes, captivating the listener. Particularly notable are the fluidity of the melodic lines and the richness of the harmonies, which also present a technical challenge for the performer. This work, which evokes the evolution of music during the transition from the Baroque to the Classical period, exemplifies Emanuel Bachʼs innovative spirit.