Desc: A Bookshelf on Top of the Sky: 12 Stories About John Zorn: Directed by Claudia Heuermann. With Joey Baron, Greg Cohen, Dave Douglas, Fred Frith. 'Claudia Heurermann directs this fascinating documentary that examines the work of experimental composer John Zorn, including live footage of Zorn's projects Masada, Naked City, and Cobra as well as improvisations, classical works, and rare interviews.