no particular order
em
diobolic
yukmouth
sav sicc
woodie
x raided
red and meth
older tech n9ne
linkon park
mike shanoda
vinni paz
hate breed
atreyu
static x
canibus
the cross movement
da truth

just a few off the top of my head

In no order..
royce 59
Krs one
Talib kweli
common
joe budden
Brother ali
Bizzy bone
Mos Def
Crooked I
Chino xl
Joel Ortiz
Wu
Tupac
Biggie
nas
Jay Z
De La Soul
Souls of michief