Legendary rap group Run-DMC was scheduled to reunite for a performance at the third annual Roots Picnic in Philadelphia, Pennsylvania on June 5th. The reunion gig has been canceled, it was announced yesterday and filling in will be Method Man, Ghostface, and Raekwon from the Wu-Tang clan. Backing them will be Philadelphia's own The Roots, who spent the last year as the house band for "Late Night with Jimmy Fallon".