Live recordings are barely a factor in hip-hop, but there's one exception. Back in 1993, Big Daddy Kane invited 2Pac and his then-unknown homie Biggie Smalls (he was still called that at that point) onstage to freestyle during his set at Madison Square Garden. Mister Cee, who later ended up becoming Big's mentor, luckily had the wherewithal to press record. The result is the only truly timeless live hip-hop recording, and with the exception of DJ Kool's "Let Me Clear My Throat," the only live rap record you'll ever hear in a club. Where Brooklyn at? Everyone knows when this song comes on.
2Pac and Biggie Freestyle at Madison Square Garden