Sir Mix-A-Lot is highly regarded for working with musicians from other genres, most notable grunge groups, as he is from Seattle.
I don't think he's worked with folk singers, though.
Jonathan Coulton brings his slightly offbeat sense of humour (chronicled here on our other blog) to a hip hop tribute to ample female posteriors. It is a very straight reading of a tongue-in-cheek song that seems to be the funniest of all. Also, this brings new poignancy to the line "Even white boys got to shout."