Partch Harrison Sandberg Reinhard: GEMS (2009)
Gems represents four rare works that simply are so iconoclastic, so original, and so peculiar in the works of the composers, that they fit best together. First microtonal Sandberg ever, and only non-Partch-himself performance of his best piece.
Recommended if you like
Charles Ives,
Henry Cowell,
John Cage.