Frank Stein and the B.G. System play Stein's psych rock arrangement of F. Couperin's 1717 "Les Barricades Mistérieuses". Side 1 features Stein's arrangement of an anonymous 15th century English keyboard piece called "My Lady." I have not been able to find any info on this release, but I think that the Diamonds label may have been based in Switzerland.
This performance makes the Mysterious Barricades sound a little too much like Pachelbel's Canon for my taste, partly because of the plodding tempo. Stein's decision to stagger left and right hand on beat 4 of seemingly every measure also gets kind of old. But I appreciate that he created some variety in timbre by using the instrument's different stops.