Jen:
This definitely sounds like Kieth and Rusty McNeil. The song list contains lots of songs we have heard them sing. Also, the "style" you describe sounds exactly like their style. Kieth introduces almost every song and Rusty says very little.
For their current web site click here
The McNiels have been friends of ours for decades and they were the ones who convinced us we should be playing in schools which we have been doing for twenty years. They started playing in schools in the sixties and have since graduated to bigger and better things (see their website)
Bev and Jerry