This one is a no brainer folks. Sign up for eMusic and recieve 50 free MP3s. I did it — no strings attached. You can cancel your trial account immediately after downloading the tracks. I got albums by the Wrens, New Pornographers, and Castanets.
eMusic is much better than iTunes in my opinion, as there is no wonky proprietary file formats or restrictions on the music files. You paid for them, you do what you will with them. Check it out.