
Continuity mistake: In the deleted scene where Elwood goes into the manager's office to quit, right before he walks in the door he sets his briefcase down, it is slightly crooked and in the center of the floor. When he goes to leave it is sitting straight and further to the left. (00:42:45)
Answer: It's 'Can't Turn You Loose,' often refered to as the Blues Brothers Theme.
rabid anarchist
Also done much earlier by Otis Redding.