Motorola Moto X — Playing another device's audio through my phone

I need an android app that will allow me to broadcast audio from one android device to another. I use a Samsung Galaxy Player 3.6 for all of my music. For all intents and purposes it is an iPod but running the Android gingerbread 2.2.3. I use this device for music only, but my Moto X for everything else. Since I do a lot of driving, I like playing my music through my galaxy to my car stereo but I also use my phone's GPS service. Since my Moto X's speaker is really quiet I want my galaxy to broadcast it's music to my phone via bluetooth and then I'd plug my phone's audio into my car.