This success was quickly followed by two more number-one hits: "Big Girls Don't Cry" (1962) and "Walk Like a Man" (1963). These records established the "Four Seasons formula": a punchy introduction, a narrative concerning romantic relationships or masculine posturing, and a climactic falsetto bridge.
The pinnacle of this second act was the 1975 single "December, 1963 (Oh, What a Night)." Co-written by Gaudio and his future wife Judy Parker, the song featured a catchy chorus and a danceable beat that propelled the group back to the top of the charts. It became their first number-one hit in over a decade, proving their ability to adapt to the disco era. This period also saw Frankie Valli launch a parallel solo career, scoring hits like the theme from Grease (1978) and "My Eyes Adored You" (1974). 4 seasons group