Nick Of Time

In the book I just read about Del Close, during his days directing Second City in the 70s, there's this from a Chicago Tribune review:

William Murray shows us how fantastically banal a nightclub singer can be.

I know that many sketches from the early days of SNL and, even moreso, SCTV, used characters and ideas they'd developed earlier (which often ended up being the weaker part of the show--socko stage material doesn't always play on TV), but I didn't know Nick Winters was an old creation.

In the comedy world, making fun of lounge singers has become a cottage industry. I wonder who was the first to think of it?