This site introduces unknown Emanuel Bach (C. P. E. Bach).
ChatGPT4o writes as follows (please note that it may not be accurate):
Emanuel Bachʼs "Wq. 89" is a collection of concertante works for keyboard and strings, highlighting his originality and technical innovation. In this collection, the keyboard instrument plays a crucial role not only as a soloist but also as an integral part of the ensemble, creating novel dialogues. "Wq. 89" fully embodies the rich emotional expression, unpredictable harmonic progressions, and ingenious formal structures characteristic of his "sensitive style." Each piece intricately intertwines the keyboard and string instruments, balancing lyrical beauty in the slow movements with energetic motion in the fast movements. While influenced by his father, Sebastian Bach, this collection showcases Emanuel Bachʼs unique musical language, expanding the possibilities of chamber music and continuing to inspire many performers and audiences.