A couple old tracks for sure, but the KNO (of cunnin'linguists fame) mixtape of Jay-Z's The Black Album was largely passed over. Mostly due to the DangerMouse Jay-Z/Beatles concept mash-up of the same album. But here are 2 of the tracks. Actually the whole thing is worth tracking down....
99 Problems-Jay-Z(KNO vs. HOV remix)
Dirt Off Your Shoulder-Jay-Z (KNO vs. HOV remix)