Any ideas on some fantastic summer concerts to see?

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Well with summer time approaching, I'm putting together my list of concerts to see in the upcoming months. I live in Delaware so I'm fortunate enough to live in the state where the Firefly Music Festival takes place. I was just wondering if anyone ha any suggestions for some must see music this summer? I have a pretty broad taste in music so nothing is off limits. I would just like to see a show that will really "wow" me. I went to a few concerts last summer that I was a little disappointed in, so I just thought that before I went out and spent my money I'd ask to see if anyone had any recommendations? Thanks!