The WZZN call letters are a leftover from the station’s days as an eighties outlet and later with an alternative/active rock format. Known as “The Zone”, the station floundered until September 26, 2005, when the station flipped to Scott Shannon’s True Oldies format.
The station’s last stint as WLS-FM was in 1991, when the station flipped from contemporary hit radio (known as WYTZ-FM, or “Z95”) to a simulcast of all-talk WLS-AM, and spun-off its own talk radio format shortly thereafter. The call letters changed again in 1996 when it became WKXK with a country format, and again in 1997 as classic rock WXCD, lasting until 2000 when WZZN and “The Zone” took over (the call letters actually changed in January 2001.).
For a complete look at WLS-FM’s history (and WLS-AM’s as well), scroll down to The Museum (it’s on the sidebar to the right) and click on Scott Childers’ or Jeff Roteman’s WLS tribute sites.