Google Play remote control, the other way arround.

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http://androidforums.com – Hello All! I have been searching for an android application for a while that lets me control google play from multiple devices in Sync. Remote4Play is an example of an App that has this functionality. But all of these apps let me control my laptop using my phone. But, what I want know is the other way arround. I'd like to plug my phone in to the Stereo and then control it from my laptop or desktop. So the phone is the device where the sound comes from. My question is, can you recommend any apps, if they even exist? A normal screen control application would also work fine, but I can't (General)