"The Ross Sisters - Aggie, Maggie and Elmira (who for some reason did not use their real-life names of Vicki, Dixie and Betsy Ross - performing "Solid Potato Salad" from the 1944 MGM musical Broadway Rhythm."
"The Ross sisters were popular in 1944. Their act gets better as it progresses and you will be amazed at how the sisters exit the stage at the end of their performance."
http://www.youtube.com/watch?v=EHEtXkReIbE&feature=PlayList&p=030032C9002FDFA2&playnext=1&playnext_from=PL&index=12
Be sure and watch it through to the end.