SPIN Magazine offers downloads of its SPIN Presents Whoachella: 10 Must-Hear Artists - Coachella 2011 MP3 Sampler for free. (The download link will be emailed to you.) That's the best deal we could find for this 10-track sampler, released two days ago. It includes songs from PJ Harvey, The Chemical Brothers, Erykah Badu, !, and more.