Dion and the Belmonts were an American vocal quartet prominent throughout the 1950s. All of its members were from the Bronx, New York City. In 1957, Dion DiMucci joined the vocal group the Belmonts. The established trio of Angelo D'Aleo, Carlo Mastrangelo and Fred Milano formed a quartet with DiMucci.

Dion Francis DiMucci, better known mononymously as Dion, is an American singer and songwriter. His music incorporates elements of doo-wop, pop, rock, R&B, folk and blues. Initially the lead singer of the vocal group Dion and the Belmonts, Dion embarked on a solo career, and was one of the most prominent rock and roll performers of the pre-British Invasion era. He had 39 Top 40 hits in the late 1950s and early 1960s as a solo performer, or with the Belmonts and the Del-Satins. He is best remembered for his signature hit songs "Runaround Sue", "The Wanderer", "Ruby Baby" and "Lovers Who Wander", among others.