“The 94-minute feature offers an entertaining overview of how technological advances in sound impacted movie history, from Al Jolson telling stunned 1927 audiences ‘You ain’t heard nothin’ yet,’ to the digital roars of dinosaurs in Jurassic Park. Credit Costin for covering an extremely complex subject without getting bogged down in the technical weeds.” – WBUR’s The ARTery, 10/31/2019