As the co-creator and executive producer of Billions, Brian Koppelman is currently in charge of one of TV’s most popular new dramas. But before he was a successful writer of films and TV shows, Brian was a music nerd who worked in the record business, shepherding the careers of a diverse group of artists including Tracy Chapman, Metallica, and D’Angelo. And he’s still a passionate fan, as Steve learned when he talked to Brian about everything from the Tygers of Pan Tang to R.E.M. to Courtney Barnett.