Synergy gives you total control over your music without interrupting your workflow. It puts attractive, unobtrusive buttons in your menu bar that allow you to navigate your music collection and control iTunes without ever having to leave your current application.

But it's not just about control; it's also about feedback. The Synergy Floater is an adjustable, semi-transparent window that keeps you informed of what's playing whenever you need to know.

Features:

last.fm integration
If you have an account on last.fm Synergy can "scrobble" for you, updating your profile with the latest information about your listening habits and preferences.

Cover downloads
If you haven't gotten artwork for a track in your iTunes library, Synergy can look for it using the massive database at Amazon.com and download it for you automatically.

Controls in the Menu bar
Switch tracks, pause or play without ever taking your hand off the mouse, no matter which application you're in, by using the Synergy menu bar controls.

System-wide hot-keys
Define your own hot key combinations for controlling Synergy and iTunes from any application; in this way you can change your shuffle or repeat settings, rate songs, tweak or mute the iTunes volume and much more.

Global Menu
The Global Menu is a drop-down menu available at all times which provides you access to advanced functionality with a single click.

Free button sets
Radically change the look of your menu bar controls by choosing from the library of hundreds of free button sets.

Extensible
With custom scripts or applications known as "Track Change Items" you can make Synergy perform any action you want in response to new tracks.

License: As of version 6, Synergy is free. If you want to use Synergy with an older version of OS X you can use the following complimentary license information:
Email address: free@wincent.com
Serial number: SYN-100-dce6-7589-307e-0497-98c7

Requirements:
OS X 10.9
64-bit Intel

Also available are:
Version 5.0a for 64-bit OS X 10.8+
Version 4.5.2 for 10.6+
Version 3.5.5a for 10.5.8+
Version 3.4.1 for OS X 10.2.8+