Fallon and The Roots teamed up with The Backstreet Boys to redo "I Want It That Way," using classroom instruments. This is actually a great version! Past classroom band artists include Camila Cabello, Fleetwood Mac and Ed Sheeran.
The group's late 1990's and early 2000's had a number of hits they could have chosen from for the segment. But the ultimate pick was obvious: "I Want It That Way," from the record-shattering hit 1999 album "Millennium."
See video below: