Lightweight "sounds similar" radio app (OSX) Is there a Mac app that offers one-click or one-keystroke access to a box where I type in a song, artist, or genre I want to hear "sounds similar" radio for (a la Pandora), hit enter, and listen?

Kudos for an app that's very lightweight.
Rdio is close. It does not have a menubar icon, but in app: ⌘F - search - Start station. 

App supports fullscreen and play and skip buttons on Mac keyboard. Miniplayer can be on top but does not allow search described above.