Next time you are at a friend's house, browse their CD collection for albums by artists you've never heard of, ask if you can borrow them, and (assuming the answer isn't "Not until you bring me the last lot back") give them a listen.
If your friend keeps their music collection on iTunes, get them to make you a 'mix-CD' of their favourite songs.
If you have no friends, acquaintances or life-long enemies will have to suffice.
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