Back again with more!
This time it's more the 'consious hip-hop', name it how you like, it's great anyways!
Starting off with Talib Kweli & Mos Def together as Black Star:
Black Star - Definition
Black Star - Brown Skin Lady
Secondly we have Common:
Common - The 6th Sense
Common - The Light
This album isn't that old and also interesting because it mixes a legendary Hip-Hop lyricist with the son of the most famous reggae artists ever
Nas & Damian Marley - As We Enter
Can't forget KRS-ONE (Knowledge Reigns Supreme Over Nearly Everyone)
KRS-ONE - Stop The Violence