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 Polonaise in D Major Wq. 116-49 (H. 323) is one of the works that showcases his unique musical style. This polonaise, while possessing the rhythmic elements of a dance, richly expresses the emotional fluctuations characteristic of his music. From the outset, it has a bright and festive atmosphere that captivates the listener. In the middle section, more introspective and delicate expressions can be observed, providing a vivid contrast. Bachʼs skillful harmonic progressions and melodic development offer a fresh surprise to the audience. The improvisational elements common in his works are also felt, making it a piece that expands the expressive range for performers.