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 notifications and Last.fm scrobbling. For other services these functions will not be available but you will still enjoy its unobtrusive behavior.
Currently supported services: Google Play / Music, Grooveshark, Pandora, Deezer
omPlayer is available on the Mac App Store