I think that one of the reasons I love concert photos is that they're so dramatic. With all the lights and fog and showmanship, there are easy ways to add drama to the shot.
If the lights are bright, lens flare can be nearly inescapable, so you might as well work with it
The extremes of light and shadow can be a bane for metering, but high contrast makes for high drama
And then there's my personal favorite: the camera tilt.
The third photo is downhere (yes, again); the rest are of the band Rush of Fools. Taken at a concert last weekend.