Stream music from Android phone to PC over WiFi

I've been searching on this site and can't find exactly what I'm looking for: I have a PC (can run Linux or Windows) that's connected to my surround-sound speakers. When my friends come around they can listen to their music by connecting their phone to my speakers using a standard 3.5mm jack. Is there a way that would let them connect their phone via WiFi to my PC and they could just play their music like they are connected directly to the speakers via a 3.5mm jack? One of the main requirements would be that they could use the standard music player in their phone. Also does anyone know if this software or configuration this would require on the PC side to work?