Heh. It's not neccessary to use flash photography if you have the right camera and the right speed film, and to be honest I find those who insist on bringing their point-and-click flash cameras into venues just damed RUDE.
That said, you need a big backpack and a whole lotta chutzpah to smuggle an SLR camera with a 210mm zoom lens, through some of those security details at concerts... that said, I used to manage it fairly regularly in the early 1990's, and OH BOY were the photos SO worth it!!!