This stuff is hard to come by, buy it here, pointer from Bryan Caplan. A few warnings:
1. The old joke about murdered cats is not groundless. It takes a long time to pick up the patterns.
2. Much of the beauty is in the timbre; even an electrified live performance can mangle this, but these CDs manage OK.
3. You have no business not knowing the high culture music of history’s most dominant culture.
4. Most of all, they are fun.