The Marvellos were an American soul and rhythm and blues vocal group that originated in the mid-1960s. They were known for their smooth harmonies and doo-wop-inspired style, with notable members including Willie Singleton and Melvin Mason. The group is best remembered for their 1965 hit single "I Do," which showcased their distinctive sound and solidified their place in the history of soul music. Despite their brief tenure, the Marvellos' contribution to the genre remains influential.