Over on the Houston board, I had posted earlier this week in a sidebar discussion:
I found the tape, and here's the moment of the switch. WZEN's first minutes were kind of rough.
WOKZ-FM_WZEN.1978.12.31-2000-Ownership+FormatChange.mp3 (3m25s)
On the tape:
1) The WOKZ news sounder, which was a pretty good news sounder, in my opinion
2) DJ intro into the final song (scoped)
3) DJ cutting off the song early because 8 pm was approaching
4) Farewell message from WOKZ-FM
5) Off the air briefly
6) A minute or more of dead air until the opening announcement of WZEN
WOKZ was interesting, too. Though I lived in St. Charles County, maybe just 15 miles from Alton, I simply could not pick up the AM. The FM, though, was a class B, and simulcasted the AM during the daytime. As you mention, it was very much a locally-oriented station with a fairly typical adult contemporary format. It also had Associated Press network news, which wasn't all that common. St. Louis' Laclede Radio (KATZ) bought the FM late in 1978 and at 8 pm New Year's Eve 1978 {time and date corrected in this quote} went all-disco as WZEN. I have a tape of that somewhere. Later it became more of an R&B station and is now KATZ-FM, having moved its city of license to Bridgeton, Missouri.
I found the tape, and here's the moment of the switch. WZEN's first minutes were kind of rough.
WOKZ-FM_WZEN.1978.12.31-2000-Ownership+FormatChange.mp3 (3m25s)
On the tape:
1) The WOKZ news sounder, which was a pretty good news sounder, in my opinion
2) DJ intro into the final song (scoped)
3) DJ cutting off the song early because 8 pm was approaching
4) Farewell message from WOKZ-FM
5) Off the air briefly
6) A minute or more of dead air until the opening announcement of WZEN