Radio Revolution, the Rise and Fall of the Big 8.
This documentary was really interesting to me, because I grew up on CKLW radio. That such a famous radio station, that was so connected to the Detroit music scene, was actually in Windsor was always really cool to me. Not sure where it can be found, but if you happen to come across this, it's pretty good.
http://radiorevolutiondvd.com/about.html