I went to Ozzfest back in 2003 (I think) when I was in high school, I went with my mom instead of friends which in retrospect is kind of embarrassing, but it's still a fond memory. I remember hating how everyone was standing up, I just wanted to sit down in my seat, lol.
That's the only concert I've ever been to, not sure if I'd be willing to go to another one, it's kind of a nightmare scenario for me (loud, confusing, lots of people). I would love to go to a Daft Punk concert though, or see a live symphony orchestra that played video game music. 