The band was jumping and the joint began to swing. You should have heard those knocked-out jailbirds sing.
7 seconds sound clip from the The Blues Brothers (1980) movie soundboard.
You can hear this line at 02:19:08 in the Blu-ray version of the movie.
Quote context
[...]
- Warden threw a party in the county jail. Prison band was there and they began to wail.
- Let's rock. Everybody, let's rock.
- Everybody on the whole cell block was dancing to the jailhouse rock.
- Spider Murphy played the tenor saxophone.
- Little Joe was blowing on the slide trombone.
- The drummer boy from Illinois went crash, boom, bang.
[...]