1) Old MacDonald had a Farm (you must include the cow)
2) If you are happy and you know it
3) La la la la, Elmo's World
4) Taking Home My Baby Bumble Bee
5) The Wheels on the Bus
and #6 (Completely and totally politically incorrect):
Little Bunny Fufu
I'm waiting for the phone call from their school telling me that they are "bopping" other kids on the head.