Wikipedia
WMVP ( 1000 AM) is the callsign of a commercial radio station in Chicago, Illinois, United States. It is owned by ABC, Inc. and operated by ESPN Radio. Its transmitter is located in Downers Grove. The station broadcasts live sports talk, both locally and nationally. Daily programming consists of talk shows that are both national and local. Mike and Mike in the Morning and the Scott Van Pelt show are done by ESPN, while Waddle & Silvy, Carmen and Jurko and Kap And Company are more focused on Chicago sports. It is also currently the flagship station of the Chicago Bulls. WMVP also airs the Northwestern Wildcats football games whenever flagship AM station WGN is unable to air the games due to other broadcast agreements.
Its former call sign was WCFL, for the Chicago Federation of Labor. The station billed itself as "The Voice of Labor" from its inception until its sale to Mutual in 1978.
During its years as a Top 40 station, like its rival WLS, WCFL's powerful nighttime signal enabled it to be heard by many listeners far outside of the Metro Chicago area. And while it was primarily a Top 40 station, WCFL featured a Sunday evening program of progressive rock music called "The Ron Britain Subterranean Circus". The word "subterranean" was in reference to WCFL featuring "underground" music, which was the term used to refer to then-emerging album oriented rock music format. This genre of music was almost exclusively carried by FM stations, making WCFL being among the few AM stations to carry album cuts as opposed to singles.