The 1980 film The Blues Brothers opens with aerial shots of heavy industry and pollution, almost a dystopia, before fading to the Joliet Correction Center, showing the release of Jake.
Why does the film open with these shots?
What are these shots meant to establish? Given that some other scenes — such as Elwood quitting his job — were cut, these opening shots must've been important.
Has John Landis or anyone else involved in the production of the film ever explained it?