For those commenting how much Kiss was effectively a full time oldies station, at its end: clearing actually listening was outside of the evidence collection process.
Kiss, much like the syndicated shows that it ran afternoons (and mornings I think), played all kinds of newer music but it was also unafraid to break into gold about 25% of the time.
Kiss didn't have a demo problem. Kiss's parent company, from what I understand, had a cashflow problem, and either CBS or Disney had a Disney or CBS problem.
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In any case, I suppose, as a child of the 90s, it makes me smile to hear Zhane again.
But, to be perfectly honest, by the 90's R&B was already stagnant and irrevocably fixated on its past. Look at a very relevant half of the urban superstars of the 90's (91-98): Tupac Shakur, the artists of Death Row Records, the artists of Bad Boy Entertainment, and the artists of Jive Records...the music on their albums was pre-SwizzBeats/MannyFresh, ie it sampled bother well known and obscure funk/disco/paradise-garage music from the 70s and 80s. Anyone who grew up in the 90's will find the "gold" WBLS plays familiar and unoffensive. But, lots of people who grew up listening to Steve Wonder in the 60s and 70s might find Tupac song that samples Steve Wonder worthy of station changing.
The safe approach is to stay the course.