assuming you want more than just east coast hip hop, i'll try to hit a variety of genres. tough, but these are all classics IMO:

Metallica - Kill 'Em All
Nas - Illmatic
The Doors - The Doors
Pendulum - Hold Your Color / The Prodigy - Music for the Jilted Generation (interchangable depending on your taste in electronica)
Opeth - Blackwater Park