Play a clip of a song, and ask the listeners what it wasn't . They have to call and tell you. if they get it right they're wrong, but wrong they're right.
Spoof songs- write a funny spoof song about the local area- here's one we made earlier.http://jackienewsletter.blogspot.com It's on there- a spoof of downtown.
I have a source as well for song beds if you want them.