I went to Millikin University, Decatur, Illinois and our "old" fight song was:

I want to go back to Millikin upon the Sangamon Where all the guys in the omnibus Are raising a heck of a lot of fuss I want to go back to Millikin upon the Sangamon I want to go back I want to go back To Millikin

The reason I mention this is because how many songs mention the Sangamon River.

Also, there is a song that I can only remember the line "Tonight along the Wabash" which is in southeastern Illinois.