This site introduces unknown composer Emanuel Bach (C. P. E. Bach). This English version was translated from Japanese one by ChatGPT.
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs Fantasia in D Major Wq. 112-02 (H. 144) is a work characterized by its strong improvisational elements and unfolds in a free form. This fantasia is marked by unpredictable modulations and rhythmic changes, offering a musical adventure that surprises the listener. Bach skillfully expresses sudden emotional shifts, leaving a profound impression on the audience. The piece is rich in ornamentation and rapid passages, demanding a high level of technical skill from the performer. It is a work that showcases the richness of expression in his music and his innovative spirit that transcends the boundaries of the Classical era.