A Great Big World and Christina Aguilera [1] made an iconic return to the American Music Awards [2] on Sunday. After performing their Grammy-winning hit "Say Something" during the award show in 2013, the pop duo and singer returned to the stage to sing their new song "Fall on Me [3]." As Ian Axel played the piano, Aguilera moved us to tears with her incredible vocals. Grab some tissues and watch their heartfelt performance above.