The Blues Brothers is among the most iconic Chicago films, and the story of how it got made is an interesting one. At the time, the city wasn’t really a destination for many filmmakers, so when John Landis and company came into town for Blues Brothers, then-mayor Jane Byrne practically gave them free reign over the city. The production generated a ton of excitement around the city, and because of that, they were able to cast a number of citizens as extras in the musical numbers. In the video above, Landis talks about how.