Philadelphia group The Majors performed in which genre of group-harmony R&B style?
The Majors (band): The Majors were an American R&B and Doo-wop group from Philadelphia, Pennsylvania. Doo-wop:  Built upon vocal harmony, doo-wop was one of the most mainstream, pop-oriented R&B styles of the time. Doo-wop:  Doo-wop features vocal group harmony, nonsense syllables, a simple beat, sometimes little or no instrumentation, and simple music and lyrics.
Doo-wop