What does the varsouviana in A Streetcar Named Desire refer to?

In the play "A Streetcar Named Desire" by Tennessee Williams, the "varsouviana" is most likely a reference to the Varsovienne, a Polish dance popular in the nineteenth century and characterized by lively and graceful waltz-like moves. It suggests a vibrant and carefree lifestyle, contrasting with the oppressive atmosphere and dramatic conflicts unfolding in the play.