Claim: WCGO was previously called WLTD and aired music, old-time radio shows, and talk shows.
Evidence: For the station in Chicago Heights, Illinois on AM 1600 that held the call sign WCGO from 1959 to 2009, see WCGO (1600 AM). WCGO (1590 AM) is a radio station broadcasting a talk format, with Korean Christian programming weekday mornings. Its call sign was changed to WLTD on November 2, 1970. WLTD aired easy listening music, old-time radio shows, and specialty talk shows. 
WCGO Evanston, Illinois WNMP (1947-1970)
WLTD (1970-1979)
WONX (1979-2009) WLTD aired easy listening music, old-time radio shows, and specialty talk shows. Its call sign was changed to WLTD on November 2, 1970.