Harmon Bethea was an American rhythm and blues singer known for his powerful, emotive voice. He was a member of several doo-wop groups in the 1950s and 1960s, most notably The Cap-Tans and The Maskman & the Agents, which combined elements of soul, funk, and gospel into their sound. Bethea's distinctive performances and the groups' innovative arrangements, such as the use of talk-singing and humor in songs like "One Eye Open," made a significant contribution to the development of R&B. Despite never achieving widespread fame, Bethea's unique style and influence continue to be recognized by genre enthusiasts.