Question: Who was the American vocalist, guitarist, and bandmate of Tony Rombola, who is ranked in the top 50 of the top 100 Heavy Metal Vocalists by "Hit Parader"
Sentence (from "Gavin Rossdale"): He helped form Bush in 1992; upon its separation in 2002, he became the lead singer and guitarist for Institute, and later began a solo career.
Relevant evidence: No