i listen to walt disney radio. its not music from walt disney world but plays music from all disney movies. can really get you in the mood for the parks
I love http://www.d-______.com/jukebox it has a HUGE selection of music, almost everything from WDW or DL you could possibly want.
Um..apparently this is getting censored, not too sure why. OK, so take epcot and replace the 'ep' with a 'd' and add in a hyphen! It really is just a Disney music site I swear!
I have found Pandora doesn't do Disney. If you want Disney radio try out www.subsonicradio.com its all Disney and has a few stations so you can always find something you like