WTBC-FM

WTBC-FM (100.3 MHz) is a radio station licensed to Chicago, Illinois, with a music format focused on a "gold" format of contemporary hit radio music from between 1990 and 2015. The station is currently owned by Hubbard Broadcasting, Its studios are located at One Prudential Plaza, with transmitter facilities atop the John Hancock Center downtown.

The station has had multiple owners since coming on the air in 1948, but has usually carried lighter music depending on industry trends, never veering too far towards any type of hard rock or rap format and specifically programmed to appeal to office listeners, and since 1997, additionally has been structured playlist-wise to avoid any competition with its higher-rated sister station WTMX.

The station began broadcasting in 1948 as WFMF, owned by Field Enterprises. WFMF aired a beautiful music format, and its programming was used for over the air background music in stores, including Field's own department stores. The station's studios and transmitter were originally located at the Carbide & Carbon Building. In 1957, WFMF was sold to Maurice, Lois, Jerome, and Lucille Rosenfield, for $125,000.

By the mid-1950s, it had the fifth most listeners of any Chicago station during evening hours. In 1955, the FCC attempted to force stations airing "functional music" to confine such programming to subcarriers. WFMF's owners successfully challenged this FCC rule in court, with the station's large listenership among the general public being cited by the United States Court of Appeals in their 1958 ruling. In 1959, WFMF became the first beautiful music FM station to be listed in a Hooper Ratings book.

In 1966, the station was sold to Century Broadcasting for $450,000. In 1970, its transmitter was moved to the John Hancock Center, while its studios were moved there the following year.

In May 1974, the station's call sign were changed to WLOO, with the "L" often written in lower case to resemble a "1" to reflect its "FM-100" branding. The station continued to air a beautiful music format; mostly instrumental renditions of pop songs along with some soft vocalists. In the late 1970s, it was the second most listened to station in Chicago. During this time, a version of its format known as the "FM 100 Plan" was syndicated by Darrell Peters to over 100 other stations across the country.

Through the 1980s, WLOO continued airing an easy listening format, albeit with more vocals by adult contemporary artists and fewer by standards artists.

In 1988, the call sign changed to WXEZ-FM, standing for "Extra Easy". The station evolved to a soft adult contemporary format, playing more vocals and fewer instrumentals. The station was simulcast on WXEZ AM 820. Its owner, Century Broadcasting, lost an age discrimination suit that was filed by announcers who they had fired and replaced with younger announcers when the station became WXEZ.