RUN-D.M.C.Run DMC: Joseph "Run" Simmons, Darryl "DMC" McDaniels (rap vocals); Jason "Jam Master Jay" Mizell (scratches). Additional personnel: Eddie Martinez (guitar). Recorded at Greene Street Recording, Inc, New York, New York. By marrying the emerging rap sound to a distorted electric guitar, "Rock Box" made the connection between rap and rock, and launched Run DMC on the road to stardom. Their middle class backgrounds differed from the ghetto roots of rap,