Below is a video clip taken recently at a Kansas City stadium. The microphones and PA system failed, thus no 'professional' singing to start the event. Instead, the crowd decides to sing together.
It reminded me of my elementary school. We sang America the Beautiful, recited the Pledge of Allegiance, and also sang the National Anthem before school. Yes, it was a public school. There was a record player in the front office of that old brick building. The school secretary would turn on the microphone then place the needle to the vinyl. I don't think these songs are taught in school any more.