This is somewhat off topic, but there's a terrific Russian/eastern European Chicago cover band that has videos up on youtube. To be honest, I've never cared particularly for Chicago, but when these guys play it, I sure like it! Some of you might also enjoy them...
Here's a sample
https://www.youtube.com/watch?v=9_torOTK5qc
Here's a sample
https://www.youtube.com/watch?v=9_torOTK5qc