Name of the baroque music in the movie Lush Life (1993)?

The original music in the movie was composed by Lennie Niehaus, and, as Arsak suggested, that includes this baroque-style piece, according to Sonya Jason, who writes that she was one of the clarinetists in that scene. I can't find evidence that the movie piece was anything but. For any more information, including answering your original question about the title, I suggest starting with his publisher(s) and/or estate.