Canadian singer Raffi is a good bet, popular with both the kids and parents. For live acoustic renditions you could come to my Little Folk with Albo concerts at the Colour House Theatre in Colliers Wood. The next on is on Saturday (Dec 6). I actually have Wheels on the Bus on my list for that one. Song sheets are provided and everyone sings along!
All the best,
Albo
For song examples and info please visit:
http://www.littlefolkwithalbo.com