Historically, this station is best known under the WMAQ call sign, which it bore from October 1922 to August 2000. The oldest surviving broadcast outlet in Chicago, it was co-founded and originally operated by the "Chicago Daily News", and became a charter affiliate of the CBS Radio Network upon their 1927 launch. Purchased by the National Broadcasting Company in 1931, WMAQ was a key station in the NBC Radio Network for nearly six decades, and later yielded adjuncts WMAQ-TV (channel 5) and WMAQ-FM (101.1 FM). A sale to Westinghouse Broadcasting in 1988 resulted in WMAQ becoming an all-news radio station throughout the 1990s. Since 2000, this station has been the third in the Chicago market to use the WSCR call sign and "Score" branding, adopting a format previously heard on the current WYLL (1160 AM) from 1997 to 2000; the format and branding originated in 1992 on the current WCPT (820 AM).