Flashmob http://en.wikipedia.org/wiki/Flash_mob
There was a Flashmob today here in Berlin at the Gedächtniskirche (Bahnhof Zoo), we sang together with a chorus for several voices:
Freedom is coming, freedom is coming, freedom is coming, yes I know!
Freedom is coming, freedom is coming, freedom is coming, yes I know!
Jesus is coming, Jesus is coming, Jesus is coming, yes I know!
Jesus is coming, Jesus is coming, Jesus is coming, yes I know!