What is your favorite Hip Hop(Pop)Rap album of all time, and why?

[Marks]

It Takes a Nation of Millions - Public Enemy
Straight Outta Compton - NWA
Lasers - Lupe
Collision Course - Jay Z and Linkin Park
Swan Songs - Hollywood Undead (not really rap, more like rap/rock)
Recovery - Eminem (I'm sure people will say his older stuff is better, but I haven't heard it really)