Parody of the old Christmas carol Past three o'clock, words and music by David W Solomons (who also performs it in the sound sample here.
See pdf file for score.
An a cappella choir is enjoying a late sing, into the small hours, but their neighbour doesn't appreciate it....
A video of this piece can be seen at
http://www.youtube.com/watch?v=nMWDn2QqxHQ