The Boston Bruins were set to take on the Buffalo Sabres in the first home game since the bombings at the Boston Marathon.
The Bruins brought out the Boston fire department honor guard and brought out Rene Rancourt to sing the National Anthem.
Before he began, the arena PA announcer asked the crowd to "sing loudly" with him.
It turns out the crowd didn't need much encouraging.
Watch below for the one of the most emotional and remarkable performances of the song you've ever seen.