Bukkit

v1.8:
added playlists! YAAAY! playlist command is /playlist, permission nodes are lastcall.playlist.create and lastcall.playlist.op; Added /lc exempt for players to not hear songs played by others; changed /playall to /play all; fixed a few exception errors
v1.7:
fixed some permissions things; Added /playall for players to play a song for all users- will be changed in a later version; Most likely fixed the custom stat for disc plays, but it has some very peculiar workings- doesn't affect gameplay.
v1.6:
Now using a snazzy extended version of MCStats called MetricsExtension/EMetrics. seem to have fixed the issue where the custom stats didn't work.
v1.5:
fixed a command that didn't check for permissions; removed an unnecessary exception handler; added plugin metrics/MCStats!; added an in-chat response for one of the commands that was missing it;
v1.4:
fixed unhandled exception errors; fixed issue with playing 11 and 13 and using disc IDs to play a disc.
v1.3:
can now specify custom countdown message, set default countdown time in the config, and can use /lastcall [time] [song] to start the shutdown time with a specific time.
v1.2:
/play and /lastcall can now use the item ID's of the discs! Fixed the message for using /play with a disc in your hand, it now uses the correct names.
v1.1:
Modified /play to allow players to play the disc in their hand when used without any parameters. Attempting to use it with something that is not a music disc yields "That is not a music disc!"

if someone starts a playlist before another one ends, it will alternate songs from the two playlists and it's just really messy. I'll have this fixed in 1.9, so until then, just do /lc exempt (or /last exempt) to prevent others from messing up your music while trying to listen to a playlist. There's also no way to stop a playlist that you've played for yourself, so be careful not to use any really long playlists if you're not sure about it.