Wireless Headphones Launching iTunes

Extending Steve's answer, plus some tips from this apple discussion, here's what I did that finally solved this.

1) Create a "Do Nothing App": open Automator, create an empty application, and save it as DoNothingApp.app

2) Rename iTunes (manually in the Applications directory, or using this terminal command):

sudo mv /Applications/iTunes.app /Applications/iTunesBACK.app

3) Make a copy of DoNothingApp.app as iTunes.app (manually, or using this terminal command):

sudo cp -R /Applications/DoNothingApp.app /Applications/iTunes.app

That's it. Of course, your iTunes is now called iTunesBACK.

I'm on a MBP with osx 10.9.2. Disabling iTunes in "CD and DVD" preferences does not help. Just renaming iTunes to something else does not work.

The service "Remote Control Daemon", rdc, is responsible for delivering commands to (for example) iTunes. Use this script, iTunesPatch. This script modifies the actual binary for rdc to inhibit the command it sends to start iTunes, which means that all other functions of rdc still works as expected.