From Wikipedia, the free encyclopedia. Rahzel Manely Brown (born October 6, 1964), is an American beatboxer and rapper, formerly a member of The Roots.[1] Rahzel is known for an ability to sing or rap while simultaneously beatboxing, as evidenced in his performances of "Iron Man" and his signature song "If Your Mother Only Knew", a hidden track on Make the Music 2000. His talents are showcased in various solo projects as well as on Ben Harper's 2000 single "Steal My Kisses." He also provided h ...