is a song composed by Bob Crewe, Sandy Linzer, and Denny Randell that was popularized by the Four Seasons in 1965.

3 in the Billboard Hot 100 singles chart, the group's highest placement since "Rag Doll" hit the top spot in July 1964.

has been attributed to the inclusion of several devices into the recording: a two-line introduction (sung by lead singer Frankie Valli), the use of two fuzz guitars (one guitarist playing low notes, another playing high notes on a fuzz bass), a chorus loaded with hooks and sung in falsetto, and backing vocals giving counterpoint with Valli's lead vocal.

"[6] Cash Box described it as a "hard-rockin' fast-moving rhythmic ode about a lucky fella who is mighty pleased that he's fortunate enough to have met the girl of his dreams.

"[7] The single's B-side, "On Broadway Tonight", was the theme of a CBS-TV variety series (1964–1965) hosted by Rudy Vallee.

[22] In 1980, the song was covered by British doo-wop band Darts who took it to No.11 in the UK singles chart.

[24] In 1995, The Manhattan Transfer covered the song on their album Tonin', featuring lead guest vocals by the original singer Frankie Valli.