While Biz Markie was a bonafide rapper and producer in the '80s era, he is known to small children as the guy who makes beats with his mouth on Nick Jr.s' Yo Gabba Gabba! children's show.

Now Biz uniting both audiences for his Lucky Charms campaign in which he explains the contest rules to the tune of "Just A Friend." General Mills, the Lucky Charms manufacturer, is asking fans to submit photos of themselves holding an imaginary box of Lucky Charms through Facebook, Twitter or Instagram. Winners will receive a box of marshmallow only treats--green clovers, pink hearts, orange stars, yellow moons, purple horseshoes, (and also new blue moons).