Very good doc on post 50s movie sound design and technology, and the independent movie makers who championed it.
Major interviews with leading sound engineer/designers Walter Murch, Benjamin Burtt, Gary Rydstrom.
Interviews with George Lucas, Steven Spielberg, Barbara Streisand, David Lynch, Robert Redford, Ryan Coogler, Ang Lee, Peter Weir, Andrew Stanton, Francis Ford Coppola, Christopher Nolan, etc.
Dr. Demian
Sweet Corn Productions