Jay-Z x kanYeWest "jockin jay-z" live - video at Glow in the Dark' concert in New York (DAPP Videos)

boogieb: Jay makin a guest appearance at New York's 'Glow in the Dark' concert. (a damn good show, was at the Raleigh one with Rihanna, Lupe, N*E*R*D, & 'Ye) to perform a lil preview of his newest track: "jockin' jay-z" off Blueprint 3 possibly? DAPP. 

get the track: here