Redd Foxx. Steve Martin. Richard Pryor. Album covers featuring the most important comedic voices of the last 40 years appear by way of prelude to Chris Rock's groundbreaking, star-making 1996 routine, Chris Rock: Bring the Pain. It's fitting: By the time Rock, who won a well-deserved writing Emmy for this HBO special, is done hammering away at such diverse targets as Marion Barry, white-on-black racism, black-on-black racism, prison rape, and a wide range of universal themes (On commitment: ''Wanna cheat. Can't cheat!'') he's joined the canon. A classic.