VIDEO: Backstreet Boys Showcase Their Harmonies on THE TONIGHT SHOW

Backstreet Boys talk about the first time they sang together 26 years ago, how their band formed and how their band is like a marriage.

Watch the interview on "The Tonight Show With Jimmy Fallon" below!

The Tonight Show Starring Jimmy Fallon features hilarious highlights from the show, including comedy sketches, music parodies, celebrity interviews, ridiculous games, and, of course, Jimmy's Thank You Notes and hashtags!

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