Bob Fosse's Manson Trio

I read somewhere that the Manson Trio from Pippin was originally choreographed to a song not in the score. It was a pop tune. I knew what song it was and I have completely forgotten.
I know that this group of theater fans should be able to assist me with my memory.
thanks.

And the Manson Trio music is a Stephen Schwartz tune called “Good Time Ladies Rag.” Ben Vereen recorded the vocal version on a solo album.

It’s a harbinger of what’s coming too: a seventies remake of a pre-rock oldie interpolated into a dark new context. This is going to become his calling card shortly after Pippin, and will define the sound and sensibility of All That Jazz.