VIDEO : Jimmy Fallon Recruits Christina Aguilera, Ariana Grande, One Direction and More for 'We Are

Talk about a triumph! Jimmy Fallon and The Roots recruited the biggest stars in the music industry for an a capella rendition of Queen's 1977 anthem "We Are the Champions." The sure-to-be viral video kicked off The Tonight Show's post-Super Bowl episode and included killer vocal performances by Christina Aguilera, Ariana Grande, One Direction, Blake Shelton, Sam Smith, Meghan Trainor, Carrie Underwood and Usher. At one point, Shelton waved to Fallon in a neighboring box.