Yesterday, we gave you a rundown of all the many hip-hop beefs that dominated 2012. Ross vs. Jeezy. Brown vs. Drake. J. Cole vs. Simmons (Okay, not all of them were important). But it got us thinking about all the classic hip-hop battle songs over the past few decades. Beef has spurred some of the best tracks in hip hop, including Notorious B.I.G.'s "Kick in the Door," LL Cool J's "4,3,2,1" and Nas' "Ether." Listen t more than 30 tracks of historic beef songs below, but keep the fighting to the studio.