Auto music arriving home......

[f1vefour]

If you have an Android phone the best way to accomplish your task is with Tasker, your RPi would need to have remote ssh access.

List of needed things:
Android phone.
Tasker for Android (Llama may work).
ssh binary for Android (I could provide this if you need it)
Remote access to your Pi over ssh

You could use NFC tags but may still need Tasker.

I would create a location specific profile that runs a command over ssh when you get close to home, it's really quite easy with this method assuming you have an Android phone. (I will help if you need it)

Or an even easier way is remote access to XBMC, then you could simply send the proper json commands over http.