uh.. he was doing "pop"
everything he does is "popular"
he did club songs.. radio hits.. collabs with jodeci, jon b, starred in a video with en vogue
did movies as a crooked cop, a dope fiend, a crazy person that kills his own friends, a stereotypical thug, etc..
but if you mean doing commercials & stuff.. or having a "thug life" clothing line, etc.. it's been going on.. how many shirts you see with his face on it?
he had videos on mtv, bet, etc..
so i don't see how pac wasn't pop to you.. you only know about him cuz he was popular.. it's not like he had a underground albums..
you know how many of his songs get played on the radio? and how many people bite off his shit to get on the radio just like him?
just open your eyes & ears.