He was born Nicholas Macioci, in Newark, New Jersey, United States. Massi had been playing with several bands before he joined The Four Lovers in 1958, including some groups that featured future Four Lovers and Four Seasons members Frankie Valli and Tommy DeVito. After the group evolved into the Four Seasons, they performed such hits as "Sherry," "Dawn (Go Away)," and "Rag Doll." He was responsible for most of the group's vocal arrangements. Massi left the Four Seasons in 1965, and was replaced temporarily by Charles Calello who, in turn, was replaced by Joe Long.
- Peter Grendysa, liner notes, "The Four Lovers", Bear Family Records BCD-15424, 1989
- Doc Rock. "The Dead Rock Stars Club 2000". Thedeadrockstarsclub.com. Retrieved 2012-08-14.
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