The dance movement now called "the moonwalk" is an old vaudeville dance step that was first seen by the general public in the 1943 film "Cabin In The Sky".
It is performed in the musical number "Taking A Chance on Love" and is performed by Bill Bailey.
Bill was the brother of the late Pearl Bailey.
At that time it was called "the backslide".
The backslide was the signature move performed by Bill Bailey as he would exit the stage.