If a friend from Mars (ie, was clueless as to the environemt) asked me if he should let his 15 year old go to a rock/metal type concert I'd say no.
The environment at concerts is electric. It is loud, chaotic and wild. It is a barely contained riot waiting to happen. I have seen sex at concerts. I have seen girls get passed overhead and get groped by each and every person along the way. I have seen a cherry bomb go off right next to a kids head and send him to the ground. I have seen uncountable fights. I have seen people piled by the aid station like a war went on, OD's, injuries, puking drunk.
I have seen security beat people senseless. The base human jungle atmosphere is alive. It is the essence of a concert. It's the WHOLE point.
In short, it is everything a 15 year old would LOVE to be part of, but there is nothing, not one developmental thing to be gained. She can go to all the concerts she likes the rest of her life when it's her choice and she can decide what to allow her 15 year old when the time comes.
I'm not worried about the kid. I'm not worried about the chaperone. It's the environment, especially at high energy shows.
If I let her go, it would simply be a matter of me holding my breath until she was on her way home. That ANY parent would want to go to a concert with a kid is WAY beyond my level of understanding. They, concerts, are the very essence of freedom and release and pure, unbridled joy and open rebellion that, by definition, are not parent/child activities, in my ever so humble opinion.
The thought of my dad going to see Nugent in 1977 with me makes my head spin and pea soup fly from my mouth. The fact that he dropped me off was the essence of "Hope you come out in one piece and good luck' parenting.
On the other hand, I know a guy my age who is comfortable going to a strip club with is dad.
So, who am I to judge...outside MY domain and responsibilities.
I would go see Slayer to this day but I ain't taking my kid and I don't even wanna take my wife. Frankly, the Chili Peppers would bore me into a coma and I'd HATE being there.