root@zomgbox:/var/log/mpd# more errors.log 
No protocol specified
E: client-conf-x11.c: XOpenDisplay() failed
Mar 25 21:14 : Cannot connect to server in PulseAudio output "MPD/Pulse" (attemp
t 1): Connection refused
Mar 25 21:14 : problems opening audio device while playing "Nerdcore/Optimus Rhy
me/School The Indie Rockers/03 - sick day.mp3"