In Asia (Japan) it is very normal that phones are forbidden at concerts. You are being warned first and if you take it out again to snap a picture for example,

In Asia (Japan) it is very normal that phones are forbidden at concerts. You are being warned first and if you take it out again to snap a picture for example, they'll boot you out. But here it's AFAIK more for the reason of selling a exclusive concert DVD after the event is over.