Another great film, and soundtrack.
The Blues Brothers were a great band both before and after the movie. I can't find the reference, but somewhere there is a quote from Duck Dunn where he recounts being criticised by a bunch of musicians for slumming it on SNL witha couple of actors. His reply was something to the effect that 1) Ackroyd really could play the blues harmonica, 2) Belushi was among the greatest vocalists he had ever worked with (think about who he worked with!) and 3) the whole band just nailed it every time. It's not on Wikipedia but must be on the net somewhere. https://en.wikipedia.org/wiki/The_Blues_Brothers