"Solid Potato Salad"

The Ross Sisters singing and dancing in the MGM musical Broadway Rhythm in 1944. You need to watch beyond the first minute to see the contortions and sometimes impressive athleticism that mark this classic performance.

More info re the young ladies here.

Addendum: Lyrics for this piece (such as they are) are posted in the Comments section by soubriquet. I'll add a reminder that in the 1940s the term "solid" was a young hipster's term for "excellent" or something to that effect.