FILE - It can rile, it can rally, it can inspire or enrage - the pre-game tradition of singing the national anthem is integral to professional sports for good reason, say athletes who draw inspiration from the crowd-rousing ritual. Canadian singer Nelly Furtado sings the Canadian national anthem before the NBA all-star basketball game, in Toronto in a February 14, 2016, file photo. THE CANADIAN PRESS/Mark Blinch, File