Amazon currently have 9 free MP3's available to download.

These include;

1.Feelings Gone Featuring Sam Sparro (Rusko's Stadium Rock Remix)
Basement Jaxx
2. Police Car Eliza Doolittle
3. Little Lovin' Lissie
4. Friday Don't Need It (Demo) Little Comets
5. Last Chance Saloon Phantom Limb
6. Camera Talk Local Natives
7. Half Mast Empire Of The Sun
8. The Consequence You Me At Six
9. One Life Stand (Joris Voorn Dusty Flower Mix - Amazon Exclusive) Hot Chip

http://www.amazon.co.uk/MP3-Download...7925031&page=1

(if the free one's don't display at the top click price to reorder)