The Jackson Five
and yes..I was wearing off brand "jelly shoes" and a fake red and black "leather" jacket my step-mum made me.
Really, it was my step-sisters thing (no...I'm not just making excuses) She was on my dads shoulders screaming and crying the whole time.
My Pops knew someone...so we got 35thish row on the floor. That was damn good for Arrowhead Stadium! I was a bit indifferent.
My first "adult"ish concert was "Whitesnake". My choice. My bad. I was about 14-15 years old. Some 30-40ish men sporting mullets got me and my best friend stoned for the first time.
They were very impressed with my torn jeans..... complete with butt cheek exposed. One middle aged gentleman was so generous he even let me sit on his lap so I wouldn't lose my turn on the joint. What a nice man!

I returned the favor by not reporting him to security (him having a miniature billy club in his front pocket and all)...
Then........ I went into the dark and easily forgetable years of Heavy Metal/Hair Bands. Now, Metallica (then) kicked ass..but Poison?? SERIOUSLY. WTF? How did THAT happen?