You probably know this, but...
...before they were the Four Seasons, they were the Four Lovers. Here's their first hit. Note Frankie Valli in the lead:

https://www.youtube.com/watch?v=Bgteu0I9fSY

Among New Yorkers of a Certain Age, this Channels hit is perhaps the most iconic Doo Wop:

https://www.youtube.com/watch?v=uTktRmMHyp0

Into the Sixties, when I worked on Wall Street, I used to see Italian guys in NY Stock Exchange gray smocks, get together in office building vestibules (for the echo effect) to sing this song.

But, I prefer their second hit. I used to stay up all night, after Alan Freed went off the air, to hear Jocko Henderson play this:

https://www.youtube.com/watch?v=JsOtxaS9W1Y
(I had this record on 78 rpm.)