A new video by Quartz is making the viral rounds, which basically offers up a sonic theory, by musician Richard Metzger, that a little trick called the "Millennial Whoop" is holding dominion over the biggest hits in pop music.

The clip cites songs like Katy Perry's "California Girls," CHVRCHES "Mother We Share," Demi Lovato's "Really Don't Care," and as recently as Frank Ocean's "Ivy" from his new album Blonde, all share a mutual "OoOoOoOoO" either in their chorus or hooks, made up of a descending fifth note to the third note, then going back up to fifth.

Basically, this simple shift is a secret weapon of drawing young listeners in, almost immediately; its sound induces a brain sensation that it's "familiar," despite it being a "new" song.

The theory also cites Beethoven's "Fur Elise," as an example of this trend of "alternating notes across a particular interval" being a common tool for songwriters in music over the centuries.

Watch below.