WJDK

The station began broadcasting in 1993; 31 years ago (1993). The original call sign was WJDK and it aired an adult contemporary format.^[1][5] In 1997, the station was sold to Big City Radio.^[6]

WYXX

In February 1998, the station's call sign was changed to WYXX and it adopted a rhythmic oldies format branded "Chicago's Heart and Soul", simulcasting 103.1 WXXY in Highland Park, Illinois, with the station's call sign and adult contemporary format moving to 95.7.^[2][6][7] In August 1999, WYXX and WXXY adopted an 80s hits format as "The Eighties Channel," with the station patterned on high-energy CHR stations of the 1980s.^[8][9][10] The station featured longtime Chicago area radio personalities including Robert Murphy, Fred Winston, and Mark Zander.^[8][10]

In 2001, WYXX and WXXY adopted a Spanish hits format, branded "Viva 103.1".^[11][12][13] By January 2003, the station had ended its simulcast with WXXY, and adopted a dance hits format as "Party 103.1".^[14]

WCSJ-FM

In late 2003, the station was sold to Larry Nelson for $426,000.^[15][16] In January 2004, the station's call sign was changed to WCSJ-FM, and it adopted a mix of soft oldies and adult standards. It was an affiliate of the "Timeless" network from Citadel Broadcasting.^[17][18]

After the network's shutdown in February 2010, the station adopted a classic hits format.^[19] It combines hits of the 1970s, 80s and 90s with local news and high school sports.