http://www.youtube.com/watch?v=hn_PF4L470w The Great John Lee Hooker. Trivia:
Some of the performers were not used to lip-syncing to their pre-recorded songs - the standard procedure for movie musicals.
James Brown ended up singing his number live with a recorded backing (the rest of his choir was lip-syncing).
John Lee Hooker's performance of "Boom Boom" was recorded live at Chicago's Maxwell Street Market.
Aretha Franklin's performance is cut together from many, many takes, using the parts where her lip-syncing was actually in sync.
The Soul Food Cafe, where
Aretha Franklin sings, was Nate's Deli on Chicago's famed Maxwell Street. It is now a parking lot.
Before Jake and Elwood go into the Soul Food Cafe, 'John Lee Hooker' gets into an argument with his band about his writing "Boom, Boom" (seen in the extended DVD version). If you listen closely as they are leaving the diner with Matt Murphy and Blue Lou, you can hear the argument still going on. And if you look closely as the camera tracks Blue Lou darting into the Bluesmobile, the argument has now escalated into a fight.