Default Nexus 7 2013 bluetooth or mount to Samsung Galaxy s3

Hello. So I am wondering if it is possible to have my Samsung Galaxy S3 share its music with my Nexus 7 2013.

So I am using Timur's Rom with my Nexus 7 2013 for my car as a headunit. I have it connected with Y-cable into startech usb hub which has my Behringer UCA222 DAC along with a 1Tb hard drive and another 128gb usb drive. The nexus can see them and play movies or music, pictures whatever is on the drives.

Now when I plug in my Samsung Galaxy S3 into the hub the nexus 7 will mount it but all I can do is view pictures that are on the phone.

I am wondering if there is an app or some program that will allow me to stream music from the phone to the tablet so it can play music through the car audio. Something with bluetooth or usb.

The issue isn't that I want music to be played from my phone because obviously i can just add it to my usb drives. But more for friends that hop into the car and want to play some music from their phone.

Anyways thanks for taking the time to give me some input.