Anyone would think it was St Paddy's day and thus loads of people were singing Irish Songs. Mine appears to be a bit more ecletic:

Reggaeforce (Don't ask. It's safer that way)
Code Monkey (Don't ask. It's safer that way)
Always (Don't ask. It's safer that way)
Living in the Sunlight (Don't ask. It's safer that way)
General Taylor
Hanging Johnny
Donkey Riding
King Gwin
Whiskey Is The Life Of Man
Blanche Comme le Neige

Those are guesses, haven't done much group singing for a while.