Amazon.com has over 1300 free songs for download. Quite a range of music there. After you download one you can check out the album it was on for what else that group performs (obviously thats the idea)
One new-tech thing you can try is the cloud. Thats a hot new term. In this case, an example would be to go to last.fm and listen to music. The more you listen and flag things as something you like, the more it can make recommendations. The recommendations are based on the info it has gathered from other people flagging what they like. So it sees that you have flagged three groups, it looks at everyone who has flagged those three groups, sees what other groups they had in common and say "you might like these". Amazon does the same thing. So does iTunes.
Anything else gets specific to what you like. Im very eclectic (all over the place) but I really like parodies and covers. So one of the places I like to check often is theFUMP.com which has some great hidden gems in it.
Gandalf Parker
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Before MP3 chores were boring. Now they're aerobics.