illustrator Francesco Poroli’s 1991-2011 Project :: via flickr.com

Nirvana/Nevermind - official release Sept. 24, 1991
Pearl Jam/Ten - official release Aug. 27, 1991
Red Hot Chilli Peppers/Blood Sugar Sex Magik - official release Sept. 24, 1991
Metallica/The Black Album - official release Aug. 13, 1991