Guercio was a record producer who also managed Chicago. From around 1971 to 1985, when a fire destroyed the studio, Caribou was the site of recordings by the likes of Elton, Paul McCartney, Joe Walsh and Amy Grant.
The filmmakers will work with Guercio on the picture, mining his stories, and the music man will serve in a producer capacity.
Miller told the Hollywood Reporter they gravitated to Guercio because of his maverick personality.
He left Hollywood to go to the wilds of Colorado and put everything on the line, said Miller. Everyone thought he was nuts. But all these artists -- from John Lennon, Michael Jackson, Elton John, the Beach Boys -- came out there. Hes basically this young guy who had a crazy dream.
Filming is expected to start in Colorado this summer.