560: The Butterfly Effect, Part 3 - The personal audio player

In this instalment of The Butterfly Effect, we hear the long tale of the mixtape: How the Sony Walkman paved the way for the iPod and streaming a million songs, TV shows and movies from our smartphones. Featuring Michael Bull, professor of sound studies at University of Sussex; Todd Green, associate professor of marketing at Brock University; and Josh Viner, founder of The Creative Lab, Toronto.