Ahhh Alice Cooper. This was my 8 year old daughter's first ever concert, just earlier this year. That was also the first time my husband and I had seen him. Fantastic show!!
When I got back from the show I was checking out videos on youtube from that night and I grabbed a crappy screenshot that shows where our seats where ... my daughter was in all pink which you can't really make out -- inside the green box from left to right was my oldest son, me, and my daughter.
She absolutely LOVED the show... and until I saw her do it with my own eyes, I didn't even know that she knew what it was to throw the horns, but damn if she didn't do it with both hands while standing there with her blonde ponytail in her pink Disney Princess outfit.
(Incidentally, her second ever concert -- also at age 8, earlier this year -- was KISS. She knew almost every song.
)