I had no idea the $25 I paid for iTunes Match turns into royalty payments to the musicians I listen to through iTunes Match. From Jeff Price:
A person has a song on her computer hard drive. She clicks on the song and plays it. No one is getting paid. The same person pays iTunes $25 for iTunes Match. She now clicks on the same song and plays it through her iMatch service. Copyright holders get paid.
/via Daring Fireball