Question: Philadelphia group The Majors performed in which genre of group-harmony R&B style?
Sentence (from "Doo-wop"): Doo-wop is a genre of music that was developed in African-American communities of New York City, Philadelphia, Chicago, Baltimore, Newark, Pittsburgh, Cincinnati, Detroit, Washington, D.C. and Los Angeles in the 1940s, achieving mainstream popularity in the 1950s and early 1960s.
Relevant evidence: No