Questions about Armarino Media Interaction

Alright, so here is the deal. I am pretty new to microprocessors and things like the Arduino board, and I am IN LOVE with this stuff. I am In a bit of a rut on this project that I am working on, though. Essentially, I want to be able to send music from my Android phone through to my Arduino, and have push buttons from the arduino send media controls back to the phone. However, I can't find any sort of tutorial, or even a list of the MeetAndroid commands/library anywhere. I'm obviously not a pro at this, so any help would be greatly appreciated.

P.S. This project is for my car, and would actually be practical and very nice for me, so it's a bit more than just a hobby project.

No. It's not practical on the Arduino

Use a RaspberryPI or similar board