The scene is Crotona Park in the Bronx, Summer 2009. As part of the True School Park Jam Series, Biz Markie (with Kid Capri and Grandmaster Caz by his side) entertains the crowd by showing off some of the "rarities" in his collection. If that weren't enough, he sings a bit of Rick James for ya.
(Shout outs to Tools of War. Props to NoisemakerMediaOne)