What's playing? (updated)

I've been posing these music questions lately to friends:

1. At what age did you first begin to appreciate popular music?
   
2. Is that age at least 15 years ago? If yes, proceed.
   
3. Can you think of two performers or groups who couldn't get your attention then, but for whom you have a deep appreciation now? Who are they?
   

Update: Andrew Ian Dodge asks just what constitutes "popular" music. I admit, I had reservations about my choice of terms. So for the purposes of this post, popular means "easily accessible through broadcast at the time." That can include country and western, bubblegum, classic rock, all fine with me.