It is definatly not just a guy thing!
Well, in my case, I blame my parents. (I'm 16) They took me to shows when I was young, and I grew up listening to The Offspring, Def Leppard, Green Day, and Depeche Mode.
We have 700+ cds, 40+ records, and I've been to around 18 concerts.
My first concert was The Beach Boys, and since then, (I wanna say that was in '97) I've seen Blink 182, Def Leppard twice, Green Day twice, No Doubt, HIM, Taking Back Sunday, B52's, Devo (my dad's request), Go-Go's, My Chemical Romance, and some more.
I usually end up spending my Saturday mornings at this grungy cd show that my dad found, and after I obviously do stuff with my firends.
But, yeah, I love music!