This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Carl Philipp Emanuel Bachʼs trio sonatas hold significant importance as works positioned at the transitional period between the Baroque and Classical eras. In these compositions, Bach inherits the contrapuntal tradition of his father, Johann Sebastian Bach, while prominently showcasing the emotionally expressive "Empfindsamer Stil" (sensitive style).
The typical instrumentation consists of two melodic instruments (e.g., violin or flute) and basso continuo. However, the keyboard instrument not only supports the basso continuo but also often plays an active and prominent role. While the movement structure frequently follows the traditional fast-slow-fast format, there are instances of more freely structured forms.
Notable characteristics include lyrical, song-like melodies, contrapuntal dialogue, and bold modulations. Additionally, dramatic changes in tempo and dynamics are often employed to surprise and engage the audience. C.P.E. Bachʼs trio sonatas served as a crucial bridge in the development of Classical chamber music.