It only took fifteen minutes for Bob Gaudio to pen the lyrics to Sherry,
which was originally named Jackie Baby as a tribute to First Lady
Jacqueline Kennedy. Producer Bob Crewe had suggested to Gaudio that he should write a song which exploited Valli's remarkable vocal range.

It reached Number 1 in America and stayed there for five weeks along with top-ten success in the British charts. Under his guidance, the group followed up with Big Girls Don't Cry and another Number 1 in the American charts ensued.

The Four Seasons were one of the few American acts to survive the British invasion of 1964. Indeed, they are the only act to have a US Number 1 hit before, during and after the Beatles successfully invaded the USA.