If you're into cheap, legitimate music buying, there's an opportunity to snap up pre-owned digital music for as little as 49 cents per track.
ReDigi.com allows you to either buy used MP3s or sell the ones you've got that you no longer want. Obviously, being that this is all digital, there would be no loss of sound quality in buying music used like there might be with a used CD, tape, or vinyl record.
And of special note, the artists get a 'commission' of sorts when their music is resold secondhand. That's unique in the industry as far as I know.
So if you want to pay for music instead of stealing it, check this out!