If you ever needed proof that The Backstreet Boys's "I Want It That Way" is the world's most perfect pop song, listen to it being performed with classroom instruments. The boys stopped by The Tonight Show Starring Jimmy Fallon [1] on Thursday, and joined forced with Jimmy and The Roots to put a nostalgic spin on the 1999 hit, complete with the requisite all-white outfits and a plethora of percussion. Almost two decades after it's release [2], the boys can still hit all those high notes and harmonies perfectly, and if anything, the track sounds even better with added maracas and glockenspiel. Prepare to take a trip back to your teens [3] as you watch the band jam with Jimmy and co., then catch them singing in an lift with a group of very lucky (and very excited) fans [4]. BSB forever, you guys.