WRCK

Chicago, Illinois' WDAI flipped from a Disco format to an Adult-Top 40/Oldies hybrid as "95 W-Rock" with new call letters WRCK.  The very short-lived switch lasted a mere 5 months (May 22 to October 20, 1980) and they then flipped to Top-40 becoming WLS-FM.  The last day of WDAI was spent stunting with a loop of Donna Summer's "Last Dance." The bottom video documents the moment of the actual format change which occurs at around the 27:40 mark.