All of them. Tribe is my favorite group of all time... I really like MM the best (love the songs and the trippy girl voice at the end of the tracks).
If you want to hear NAS's sick first debut, check out the Main Source albumn "breaking atoms". The song is called "live at the barbeque".
You should also try KRS ONE's & DJ Scott LaRock "Boogie Down Productions"
http://www.youtube.com/watch?v=tGz3GdPHKzs,and theres tons more...