There are certain songs that when you hear them on the radio you have to turn all the way up and sing. As a DJ for weddings I know most of them and when I want the whole room to start singing together I will play one. There is something about watching 200 people sing together that makes me smile. It must have been the same for the people who organized this sing-a-long.
They got 1500 strangers together in a auditorium and gave them each their parts to sing. They don’t just all sing the song the whole time, there are sections assigned to certain parts and the conductor coordinates them from the stage. The song of choice? Backstreet Boys “I want it that way.” The new classic song that everyone LOVES belting out as loud as they can.