Jimmy Fallon, Dan Aykroyd and The Roots all sang the blues on Tuesday night.
After a rousing intro from host Fallon, Akyroyd -- as Blues Brother Elwood -- performed "I was Born in Chicago" with "Late Night With Jimmy Fallon's" house band.
On and off-camera, Fallon was up, dancing and clapping to the bluesy tune. After some time jamming on stage, Aykroyd took his wireless mic, his harmonica and the cameraman for a walk through the NBC studio halls at 30 Rock to finish the song.
The stroll ended in Aykroyd's dressing room where he changed out of his Blues Brothers garb and into regular late-night hose guest clothes. That's when the dancing began.
Watch the clip: