I haven't been able to find any apps in the Windows store that allow me to stream music from my Nokia Lumia 920 to my Xbox 360, PC or anywhere else. There is an app called "Airshare" but the trial is very limited and can't even get that to function properly & it has 0 reviews. On my iPhone 4s there is an app called "Airmusic" that allows me to stream music from my phone to my xbox 360 when playing a game so I was looking for something similar on WP. Any suggestions? Here's a link to Airmusic so you know what i'm looking for..
https://itunes.apple.com/us/app/airmusic/id409782234?mt=8&at=10l3Vy
https://itunes.apple.com/us/app/airmusic/id409782234?mt=8&at=10l3Vy
"Access and stream your iPhone, iPad or iPod touch Music Library directly over WiFi from an Xbox, a PS3 or any compatible DLNA device. No Wires or special hardware needed! It can even stream to a PC running Windows Media Player."