When you sign up for a free trial of Emusic, you'll get to download 25 songs for free!
This is a trial of the music subscriber service, and it requires your credit card number, but if you cancel, you won't be charged, and you'll even get to keep the 25 songs you downloaded during the trial!! How cool is that!
If you would like to keep the service though, it costs $11.99 or $0.40 per song for 30 songs each month - a much better deal compared to iTunes!