Think you don’t know any Frankie Valli songs? Think again.

The iconic voice behind The Four Seasons has been sneaking into your playlists for decades—you just might not have realized it.

From movie soundtracks to wedding playlists, Valli’s hits are everywhere, even if his name isn’t always attached.

Here are five Frankie Valli classics you’ve definitely heard (but probably never knew were his).

1. “Can’t Take My Eyes Off You” (1967)

This timeless love anthem is the ultimate earworm, covered by everyone from Lauryn Hill to Andy Williams.

Fun fact: Valli’s label initially hated the song’s unconventional structure, but he fought for its release—and it became his biggest solo hit.

You’ve heard it in The Deer Hunter, 10 Things I Hate About You, and roughly a million proposal videos.

2. “December, 1963 (Oh What a Night)” (1975)

That funky disco jam you can’t resist dancing to? Yep, that’s Frankie.

Originally written about the repeal of Prohibition (seriously!), the lyrics were tweaked to celebrate a more… personal kind of liberation.

It skyrocketed to #1 and still dominates throwback parties today.

The title track of the mega-hit musical wasn’t performed by John Travolta or Olivia Newton-John—it was Valli’s falsetto that opened the movie.

Written by Barry Gibb of the Bee Gees, it’s a perfect blend of disco and doo-wop that’s impossible not to sing along to.

Before Fergie’s 2006 hit, this was a Four Seasons staple.

Inspired by a John Wayne movie line, it showcased Valli’s signature soaring vocals and became their second #1 single.

Fun twist: The band’s guitarist Bob Gaudio wrote it in 15 minutes while hiding in a bathroom to avoid a fan.

This cheeky doo-wop gem was The Four Seasons’ third consecutive #1—and it’s been stuck in your head since Dirty Dancing.

The lyrics were a playful jab at macho culture, with Valli’s falsetto turning stereotypes on their head.

So, how many of these did you already know were Frankie Valli’s?

His voice is the secret soundtrack to your life, weaving through generations of pop culture.

Next time one of these plays, you’ll have the ultimate trivia to impress your friends—or just bask in the glory of a true legend.