USPS - Round, Round, Round - by Al Jarreau

From his Breaking Away album, 1981.
It was bugging me for a good week until I realised the USPS new commercial was using the music from Round, Round, Round as it’s theme. And then, suddenly, I was singing it! All the lyrics came rushing back to me.

Question, though: Is it original from Jarreau? Or did he adapt an older theme?

Interesting

So, which is it?

Dave Brubeck’s Time Out - recorded in 1959

That explains it, then. And answers the OP. Brubeck did it first. Thanks.