This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs "Alla Polacca in D major, Wq. 116-6 (H. 217)" is a work that shines with his unique style. While based on the rhythm of a polonaise, the piece showcases his innovative expressiveness throughout. The melody is characterized by its lightness yet concealed passion. The structure of the piece is simple, yet unexpected modulations and rhythmic changes captivate the listener. Through this work, one can enjoy the wide range of emotions in Emanuel Bachʼs music and his forward-thinking expressive techniques. Particularly, his improvisational elements allow performers the freedom of interpretation, offering the audience a fresh surprise.
For an overview of Wq. 116 as a whole, see Character Pieces Wq. 116 .