MPD is a music player deamon that can play music controlled from a various number of clients, some of which are command line front ends, some are in the browser, some have a GUI. The cool thing about MPD is, that it allows you to play music on one Linux machine and control it from a number of other devices (e.g. even via your phone). Perfect for a multiplayer-jukebox.
Ever wondered how control VCVRack (a great open source modular synth software) with arbitrary data from a python script?