Leave it to viral maestro Jimmy Fallon to assemble an all-star cast to sing an a cappella version Queen's "We Are The Champions" in honor of Sunday's Super Bowl outcome. Fallon and his house band The Roots pre-recorded the go-to sports anthem with Carrie Underwood, Sam Smith, Ariana Grande, Blake Shelton, Usher, Meghan Trainor, One Direction and Christina Aguilera.