Didiom

Check out this free application! It's a fun way to search, sample, buy and download music on your wireless! You can also place bids for the music you want and share individual song picks with other friends and family--right from your wireless!

Currently they are running a promotion.

http://www.didiom.com
http://www.didiom.com/clip
http://www.didiom.mobi (use your phone)