Gosh, I hate to admit it, but there IS music other than jazz in Eastern Iowa.
Take a look at some of the following if you are silly enough to want a small vacation from jazz.

Eastern Iowa Swing http://www.eiowaswing.com/

Cedar Valley Dance Club http://www.members.tripod.com/hildaostby/index.htm

Linn County Blues Society http://www.lcbs.org/

Legion Arts/CSPS http://www.legionarts.org/

Of course, for "real music" you still need your jazz fix, and you need to return to the Jazz Society of Eastern Iowa