Use MPD as a backend

[dfreedm]

Music Player Daemon seems more suited to the task of being in a client/server architecture, as that's how it was designed.
Mplayer has always been a little finnicky.
Music Player Daemon

[avuserow]

MPD has some problems:

• Built in database is almost required. There's a way to get past it and play an arbitrary file path, but I couldn't trigger the condition.
• There wasn't a way to block on a play command or similar, so you have to poll it. "Done playing yet? Done playing yet?"

A better idea might be moving to a good HTTP streaming server, and just play the stream on the player boxes. We could even do something hacky with ffmpeg, netcat, and mpg123, but that doesn't seem right :P