I have not tried this particular concept (as I don't own an android phone), but JRiver has an app called GIZMO that can stream music from your JRiver media player install acting as a server on a PC somewhere.
It can also remotely control the server, so, say you have it runnning on a PC upstairs, connected to a radio device that just streams the audio out, out to your patio. you use your phone to control what's playing, volume, etc.
BUT, if you prefer, you could stream the music directly to your phone with Gizmo.
Check here
http://yabb.jriver.com/interact/index.php?topic=58230.50I have used the WebRemote functionality, though and it's great for remotely controlling JRMC.