One of my favourite Cleveland groups are Sly, Slick and Wicked. I have only just been pointed in the direction of a very interesting article based on an interview with John Wilson called Memories Of The Chitlin' Circuit in the Free Press.
For further info on the group - check out these links:
Sly, Slick & Wicked 1
Sly Slick & Wicked 2
The guys also have a MySpace where you can catch some video of them.
There is also an article in Soulful Kinda Music 43 which is worth trying to pick up