I'm just saying a crowd is usually too busy getting excited to have the time to actually sing a song. Here there are so few moments where the crow stops to exclaim themselves, that to me it indicates the sport is very slow and devoid of excitement.
BWAHAHAHA! Dude, have you never been to an American sporting event? Super Bowl, people in the stands getting beer, hotdogs. Baseball, same. Hockey, same. All while the game is going on.