Great shot at the beginning of the thread! I also quite like the shot from applemint, although it's more of a portrait than a concert shot.
@JTM_CR: It's challenging to shoot a concert with an iPhone for sure, but it's not impossible to get stunning photos. After all, it's all about getting the moment.
I personally don't like shooting concerts. I always feel like one of dozens of lemmings running around with their cameras. Than better enjoy the concert itself and photograph the band as soon as they give you a private concert. Well, I probably should better say if the give you a private concert.