Here is the audio, video, and transcript .  Here is the episode summary: Bob Spitz has written major biographies of the Beatles, Led Zeppelin, Bob Dylan, and now the Rolling Stones — but also, somehow, Ronald Reagan and Julia Child. In rock, his credentials were hard won: he started out hustling gigs for an unknown Bruce Springsteen for six years, moved on to handling Elton John’s American business, and spent long enough in the world to find himself jamming with Paul McCartney and chatting with Bob Dylan on a stoop in the Village. The Reagan and Julia Child books are harder to explain, and perhaps that’s the point—Spitz seems to do his best work when he has no business writing the book at all.…