Before a Green Day concert, they played Bohemian Rhapsody over the speakers. The packed crowd — obviously — sang along, creating this thing of beauty. (Some people are even singing the guitar solos.)
BTW, if you're wondering why you can't sing in perfect tune like apparently the tens of thousands of people attending, well, individually the people attending aren't perfect singers either. This is a great example of constructive interference: all of the in-tune sounds add up (since they match), and all the out-of-tune sounds are damped out (since they are wrong in all different ways), producing as a net result a perfect rendition from the crowd as a whole.













