Lots of things but one of my purchases is probably my favorite playlist for on the train and such:
The Rolling Stone Magazines 500 Greatest Songs Of All Time
An amazing list with various genres (ok it lacks metal overall but how long has it been sins RSM really payed much attention to metal?)
Granted, there are some total shit songs on it as well (Eminem really? :unsure: ) but I just delete those right away. So now I've got this huge playlist containing: Blue Oÿster Cult, Iggy Pop (& The Stooges), Bob Dylan, ACDC, Bo Diddley, Bowie, The Who, The Kinks, Neil Young, Zeppelin, Johny Cash, Jimi Hendrix, etc.)
:dio: