Dave Grohl and his mother, who has written a book about her and other mom's experiences as mothers to Rock stars, guested together on Wednesday's (4/26)Late Show With Steven Colbert. During the course of their conversation with the host, the subject of Kurt Cobain's death came up. Virginia said, 'It was such a dark, sad time, and Dave came home after that, so we all sort of had to regroup. We talked a lot - we've always been able to say anything to each other - but that was a particularly incredible time. It's hard to express.' Here is some of the rest of the visit.