Joan Rivers Tonight Show Theme

[QX Ripley]

I've searched around the internet for info on Joan's Tonight Theme(I initially thought it was a popular song around that time period (early 1980) to no avail. Then I searched Doc Severinsen's catalog(of his records of jazz standards). Still it could be a jazzed up version of a popular song(Isn't she lovely? Jazzed up).

So it may be a production theme/cue etc.  Or it may be an obscure jazz fusion track around that time period as well.

Thanks for any help on this theme.