Rock n Roll Grad School #204- The 501 Definitive Records of the '90s

What records define the '90s as a decade to be remembered? Is it NSync? Nirvana? What about hip-hop?Thankfully, music writer and editor Gary Graff is here to muddy the water and start all sorts of disagreements with his new book, "501 Essential Albums of the '90s: The Music Fan's Definitive Guide," available November 5th from Motorbooks.