About Jam Master Jay:
Jason William Mizell was an American musician and DJ. He was the DJ of the influential hip hop group Run–D.M.C. During the 1980s, Run-D.M.C. became the biggest hip-hop group and are credited with breaking hip-hop into mainstream music.
There's no way that if you get participation out of a person can they say you didn't rock it.
Jam Master Jay