>>>We were actually on the floor in front of the sound board. no elevation above the crowd.<<<
At least with Springsteen, they provide a riser to stand on. Sometimes the riser is very short so I started bringing a step up with me in my camera backpack. It folds flat and fits in the laptop pocket and only cost 8 dollars in my local Ace Hardware store. One of the best pieces of photographic equipment I have ever bought.