Tough Talk, Tougher Challenge

50 Cent says he'll retire if his latest album, Curtis, doesn't outsell Kanye West's Graduation. But if neither album does well, hip hop might face something even more daunting than the loss of a star. We talk with Sasha Frere-Jones, pop music critic at The New Yorker magazine, and Greg Kot, Chicago Tribune pop music critic and co-host of public radio's "Sound Opinions."