Factotum

Control music on the web with your keyboard. You know how media keys on your keyboard don't work with music sites? Factotum fixes that. Factotum is compatible with 16 awesome music servies: Amazon Cloud Player, Rdio, Grooveshark, Hype Machine, Pandora, Last.fm, Napster, Playlist.com, 8tracks, Purevolume, Mog Chrome App, Live365, BBC iPlayer, Songza, Jango, We Are Hunted, Deezer, thesixtyone, and Blip.FM. To use Factotum, just hold Option + Shift and press your Mac's media keys. It works as expected! Currently works with both Chrome and Safari. More browser support soon!