The band thing was cool! I played french horn and trumpet in school (many moons ago) and would have loved doing something like that! I love that music too, and it's been a long time since I've heard "Stars and Stripes"!
The flash-mob thing was disturbing! I've never heard of that. You think of things like that happening after something like a natural disaster or the Rodney King verdict, not just random events by bored kids. Sad shape things are getting to.