What is the 'Black National Anthem' performed before the Super Bowl?

(WHTM) -- The NFL continued a tradition before this year's Super Bowl. Ahead of kickoff, fans were treated to a series of performances from Green Day, Coco Jones, Brandi Carlile and Charlie Puth. Grammy-winner Jones performed a string-backed rendition of "Lift Every Voice and Sing," also known as the "Black National Anthem." Sunday's game marked [...]