Assuming you aren't a hater of Hip Hop (others would say Gangsta Rap) I'll pitch in Notorious B.I.G Ready to Die. Amazing album. Biggie had an unreal talent for story telling.
Also Public Enemy Fear of a Black Planet.
Since we are talking 90's a few more artists would be, Alice in Chains, Soundgarden, Nirvana, Smashing Pumpkins, Pearl Jam, Rage against the Machine.