The ROSS SISTERS- "Solid Potato Salad"
 
Went out seeking a movie with people 
LOOKING FOR A STAGE.

Ran across this MUST BE SEEN gem.

From the 1944 MGM film, Broadway Rhythm

https://www.youtube.com/watch?v=d1J3NLNWAPU
 
I don't know if a more amazing act has ever been put on film..!