Update (11/18 4:00pm): Google Play also has the new Burning Bridges album by Ludacris for free as well.
Google Play offers a free download of the Guardians Of The Galaxy (Awesome Mix Vol. 1) album. As a pricing comparison, it’s currently listed for $8.99 on iTunes and $7.99 on Amazon. While you’re at it, you might as well preorder Guardians of the Galaxy on 3D Blu-ray/Blu-ray/Digital Copy for just $19.99. That’s a fresh price drop from $25 and 50% below list.