Its not so much what I listen to but how much of it I can listen to. So where I can toss on John Coltrane and leave it on all day, 20 minutes of Cannibal Corpse or Slayer is about fine.
The easy way to do this is just to list the bands that I have more than 4 or 5 shows/CDs by:
Bob Dylan, Mozart, Chopin, Grateful Dead, Blue Oyster Cult, Ozric Tentacles, Beethoven, Miles, 'Trane, Glenn Miller, AC/DC, Joan Baez, Johnny Cash, Francis Vincent Zappa, Neil Young, Yardbirds, Robert Johnson, Jeff Beck, Traffic, Skatalites, Pink Floyd, Gov't Mule, Motown/Stax/Volt and the Beastie Boys.
But I have lots of old dance stuff, country stuff, marching bands, world beat, traditional music, jazz, rock, pop and even a few Brittney Spears songs - hit me baby one more time.
I have 7 complete Led Zeppelin shows spanning their entire career, but none of the studio stuff anymore. And I've downloaded a big pile of shows by Paul Oakenfold, Sasha and Digweed, Cut Chemist, DJ Shadow and all those guys.
I also have a pile of stuff by the Vanilla Fudge, CDs, live shows, rehearsal tapes, demos - the best band that everyone forgot.
Oh yeah, I'm a total fan of Ennio Morricone and listen to his soundtracks all the time.