#3: The Moonglows (1951)
Formed in Cleveland, The Moonglows brought rich harmonies and smooth delivery to early R&B. Their 1954 hit “Sincerely” showcased a polished sound that bridged gospel and doo-wop. Producer and singer Harvey Fuqua later mentored Marvin Gaye, connecting the group to Motown’s rise. Though often overlooked, their style helped shape modern soul and vocal harmony groups.

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