Significator for iTunes is a simple application to control iTunes. It combines simplicity and functionality. It’s a menu-bar app, so you never loose focus of what you’re currently doing if you just want to quickly choose a specific song. With Notification-Center you can always see what song is playing, if it has changed. The application supports global shortcuts and multi-touch gestures to make navigating through your library even easier.
There are plenty of iTunes controllers out there, but Significator looks great (it is Retina-ready) and is completely free! I’ve been using it for a few months and love it! Grab Significator from the Mac App Store.