I always wear eagplugs to a concert for several reasons, one, I'm usually next to the speakers, and two, by drowning out the music it allows me to concentrate on the musicians themselves and predict what they might do so I can catch a good shot.
This is a band called Hatebreed, who played at the GwarBQ. They were so bloody loud it was like I didn't have earplugs at all. I've never encountered a band that could penetrate what I have for hearing protection. Needless to say, I shot a bit of the band and got out of the pit as fast as possible. I have no idea how they managed to be that loud.