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In page Disco:

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Six months prior to Disco Demolition Night (in December 1978), popular progressive rock radio station WDAI (WLS-FM) had suddenly switched to an all-disco format, disenfranchising thousands of Chicago rock fans and leaving Dahl unemployed. WDAI, who survived the change of public sentiment and still had good ratings at this point, continued to play disco until it flipped to a short-lived hybrid Top 40/rock format in May 1980. Another disco outlet that competed against WDAI at the time, WGCI-FM, would later incorporate R&B and pop songs into the format, eventually evolving into an urban contemporary outlet that it continues with today. The latter also helped bring the Chicago house genre to the airwaves.[citation needed]