I think available light is the best way to go for concert images, more fun (because more challenging)...
Dave Cousins (Strawbs) 1/15 second ISO 1250
Go-Betweens 1/2 second ISO 1600
Tony Levin (Peter Gabriel, King Crimson, TLB, much more) 35mm film ISO 400
Jeff Berlin (Bill Bruford Band) 35mm film ISO 400
Howard Devoto (Buzzcocks, Magazine) 35mm film ISO 400
David Byrne (Talking Heads) 35mm film ISO 400
"Live Music" gallery here:
http://www.pbase.com/rsub8/live_music