I think I can help out a little. From '79 to '88 I worked at radio stations not too far away from Sandwich, Morris, IL and Joliet, IL. If I recall, Sandwich was also an AM/FM combo. In many small markets, the AM tends to be very localized and full service while the FM often is automated. Sounds like, at least for the period of time you heard it, the station was automated using music recorded by the people at the station, as opposed to using a music supplier or satellite service. Sounds like one of the people making those big 10 1/2 inch reel to reel tapes was a Lighthead!
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