Hi...For music I use my iPhone; I have the stock radio that runs through an aftermarket amp. It is installed under the trunk and mounted to the right front inner fender well...I just unplug the radio imput and replace it with a long RCA cable to the iPhone; it is then running directly through the amp.
To control the volume, and or to change tracts, I use a Satechi Bluetooth Remote controller..
It works great! ($34.00)
Satechi Bluetooth Remote