The 100 Greatest Choruses of the 21st Centur

Today marks the beginning of Chorus Week here at Billboard, where we'll be deep-diving into some of the greatest recent refrains that drive every successful karaoke night, concert encore and office desk hum-along. While most of the great choruses of the 20th century -- from "Be My Baby" to "Livin' on a Prayer" to "I Want It That Way" -- have gotten their decades of due, we felt it was time that to start figuring out the new canon: Which choruses from this century will have the power to get a bar full of strangers singing in unison at the top of their lungs decades from now?