Are  Jeff Mangum and Zack de la Rocha in the same industry?
Zack de la Rocha Zacharias Manuel de la Rocha (born January 12, 1970) is an American musician, poet, rapper, and activist. He is best known as the vocalist and lyricist of rap metal band Rage Against the Machine from 1991–2000 and 2007–2011. He left Rage Against the Machine in October 2000 and embarked on a solo career. With former Mars Volta drummer Jon Theodore, de la Rocha also co-founded One Day as a Lion in 2008.
John Doe (musician) John Nommensen Duchac (born February 25, 1953), known professionally as John Doe, is an American singer, songwriter, actor, poet, guitarist and bass player. Doe co-founded LA punk band X, of which he is still an active member. His musical performances and compositions span rock, punk, country and folk music genres. As an actor, he has dozens of television appearances and several movies to his credit, including the role of Jeff Parker in the television series "Roswell".