Frankie Valli (born Francesco Stephen Castelluccio; May 3, 1934) is an American singer and actor, known as the frontman of The Four Seasons beginning in 1960. He is known for his unusually powerful tenor/head voice.
Valli scored 29 Top 40 hits with The Four Seasons, one Top 40 hit under The Four Seasons alias The Wonder Who?, and nine Top 40 hits as a solo artist. As a member of The Four Seasons, Valli's number-one hits included "Sherry" (1962), "Big Girls Don't Cry" (1962), "Walk Like a Man" (1963), "Rag Doll" (1964) and "December, 1963 (Oh, What a Night)" (1975). Valli's recording of the song "Can't Take My Eyes Off You" reached number two in 1967. "You're Ready Now", a Valli solo recording from 1966, became a surprise hit in the UK as part of the Northern soul scene and hit number eleven on the British pop charts in December 1970. As a solo artist, Valli scored number-one hits with the songs "My Eyes Adored You" (1974) and "Grease" (1978).
Valli, Tommy DeVito, Nick Massi and Bob Gaudio – the original members of The Four Seasons – were inducted into the Rock and Roll Hall of Fame in 1990 and the Vocal Group Hall of Fame in 1999.