Isotope 217° were a Chicago based band composed mainly of members from Tortoise and the Chicago Underground Orchestra that was formed in 1997. The New York Times described the band as "..adept to varying degrees at rock and funk and jazz and electronics, turn those introspective moments into jams that are messier and warmer than Tortoise's."
These are photos from concerts where Isotope 217 played, so they may be of other bands that played the concert as well.
Tortoise / Isotope 217 Apr 9, 1998 Bielefeld, North Rhine-Westphalia, Germany Uploaded by Moron2