Due to the limitations imposed by Mac App Store sandboxing requirements that make it impossible to support keyboard media keys out of the box, omPlayer will now be distributed outside of the Mac App Store and is free.
omPlayer is a special minimalist web browser to comfortably listen to music from online music services. For supported services it lets you control playback from menu bar or from any application with global shortcuts and media keys, supports Growl / Notification Center notifications and Last.fm scrobbling. For other websites additional functionality will not be available but you will still enjoy its unobtrusive behavior.
Currently supported services: Google Play Music, Grooveshark, Pandora, Deezer, Rdio.
Download omPlayer from http://mifki.com/omplayer