Music - good. Cloud music sans DRM - good. Free music? Even better!
Courtesy of Amazon Local, for a limited time (a limited quantity of vouchers are available), you can grab a free £2 credit for Amazon MP3, which also happens to have a very nice Android app (if you're outside of an official Cloud Player territory, I've also made a patched version).
Getting your voucher couldn't be easier - simply head on over to the Amazon Local page, fill in your details and the voucher will arrive in your e-mail. No minimum spend is required to use it, but you must use your voucher by the end of March or it will expire.
[Edit: Get 25% off your next order too - details on this page!]