This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Wq. 118/10 "Variations on an Arioso" is a lyrical work that utilizes the characteristics of the Empfindsamer Stil, based on a beautiful, song-like melody. The arioso, which serves as the theme, features a soft and gentle melody imbued with intimate emotions. In these variations, while maintaining the fundamental character of the theme, the decorations, rhythm, and harmony are skillfully altered with each variation, adding musical depth. Particularly, some variations incorporate contrapuntal elements, highlighting structural intricacy. In addition to the melodic embellishments and rhythmic diversity, the modulations and the construction and release of tension within the musical flow impart a dramatic character to the entire piece. Performers are required to clearly express the different characters of each variation and consistently maintain the musical flow. Wq. 118/10 is regarded as a piece that symbolizes Emanuel Bachʼs expressiveness and creativity in keyboard music, deeply moving its audience.