It was a pivotal game 4 in the Predators NHL Playoff game against the Chicago Blackhawks. 
If the Preds won, they advance to the second round, and if not, they return to Chicago for game 5.... 
They had Luke Bryan to rev them up for the game, he surprised the crowd to sing the National Anthem! 

PREDATORS WIN! They are now advancingto the next round of the playoffs... wonder who will be next to sing the anthem for them?!