Free Your Mac’s Media Keys from iTunes
The tricks we used before were far less than ideal, requiring you to start up Quicktime in the background, or do some serious hacking to system files within iTunes.app. NoMitsu has created a one-click installer that patches the remote control daemon, the app responsible for managing the media keys. Just download the patch and double-click on it. After entering your password, your media keys will be free from iTunes’ grasp.
I installed this and it works perfectly.