SpotiMy - Play/Pause and Next/Previous functions for Spotify directly on your Menu Bar!
Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Covergloobus - This is a simple application to show the cover and the info of what is playing in your favorite...
Skip Tunes - Control iTunes, Spotify, or Rdio from your Mac's menubar
Owlead - Grow your Twitter with valuable followers, effortless