For Six Hands at One Piano.
THIRTY FINGERS is a series of books of various standards for three players on one piano.
The corresponding sheet music is for players of around Grades 6 to 8 standard. The movement is taken from one of Bach's Trio Sonatas for the organ.
This is a practice CD containing a recording of a complete performance followed by three recordings each with a different player's part missing so you can play along with your two partners even when they are not there!