Stuff that is awesome on my M60s:
David Sanborn - Songs from th night before (much better recording than other Sanborns I have).
Chet Atkins - Greatest hits
Chet Atkins & Mark Knopfler - (don't remember the title).
Skatalites - Balls of Fire
Shaggy - Hotshot
Bach - Concerto for 3 harpsicords in D minor. BWV 1063. (Particularly the Allegro; is that a well known masterpiece, John, or just something I like?)
Ottmar Liebert - Summer Flamenco
Arturo Sandoval - Trumpet Evolution (contains samples from many music genres and thus doesn't flow like an album should, but it still is awesome).
Melvin Taylor and the Slack Band - Dirty Pool
Junior Wells - Everybody's Gettin' Some

All of the above are particularly nice recordings as well as being good musically. The Bach came from a 3 cd set of harpsichord concerti, so you would have to really like the harpsichord to get that particular recording.
Cheers.