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 Alla Polacca in A minor Wq. 113-5 (H. 197) is a work that stands out for its wide range of emotions within his keyboard music. While based on the rhythm of a polonaise, this piece possesses its own unique expressiveness. The A minor tonality imparts a shaded atmosphere that leaves a deep impression on the listener. Bach skillfully employs unexpected modulations and rhythmic changes to captivate his audience. The use of ornamentation and dynamic variations adds further depth to the music. The improvisational elements common in his works are also present, allowing performers the freedom for personal interpretation. This Alla Polacca exemplifies Bachʼs creativity and technical prowess.