Sharing music on a Ubuntu box with iTunes

Download 'Tangerine' via the Package Manager.
Once installed you can find it under the Accessories menu... go through the 10 second config screen. In my case I told it to find music in Rhythmbox.

You should now be able to find your shared library in iTunes... if not make sure you have "look for shared libraries" checked under Preferences-> Sharing.

That's it.