First of all, if you read your stage directions carefully you'll notice that Williams uses music to establish the mood of many different scenes in Streetcar. It’s basically like watching a movie, where the music is fast-paced during a chase scene, tender in a love scene, etc. But we’re interested more in the specific songs that are used repeatedly as symbols in the play – starting with the "Varsouviana." Williams mentions the name of this polka in his stage directions, but Blanche, too, gives its name in Scene Nine. This is important, since those watching the play instead of reading it don’t have the benefit of Williams’s commentary. If he wanted the audience to know the tune, he had to place it in the dialogue of one of his characters.
Now what is this Varsouviana? Why haven’t we heard of it? Well, it’s a polka tune, so unless you’re into that you likely wouldn’t have encountered this song before. It sounds a bit like merry-go-round music, which you can imagine is eerie to hear in a Gothic-type drama on the stage. Or, if you don’t feel like imagining, watch this a man play it on the accordion on YouTube. Or listen to a 30-second clip on iTunes; there are a few.
Anyway you get the point. It sets the mood of Blanche being unstable and imagining creepy music that no one else can hear. It also helps when she explains that her husband killed himself while the Varsouviana Polka was playing. She can’t escape the guilt of feeling like she caused his suicide. She can’t escape her husband’s death, so she can’t escape the music, either.
What else have we got for music? How about the song "Paper Moon" that Blanche sings while she’s in the bathtub in Scene Seven? Just a random ditty? Take a look at the lyrics before you write it off. These lines – all sung by Blanche – are interwoven with Stanley and Stella’s argument:
(singing) "Say, it’s only a paper moon, Sailing over a cardboard sea—But it wouldn’t be make-believe If you believed in me!
It’s a Barnum and Bailey world, Just as phony as it can be— But it wouldn’t be make-believe If you believed in me!
Without your love,
It’s a honky-tonk parade!
Without your love,
It’s a melody played in a Penny arcade…
It’s only a paper moon, Just as phony as it can be— But it wouldn’t be make-believe If you believed in me!
It’s a Barnum and Bailey world, Just as phony as it can be." (9.30-45)
We-lllll, what do we have here? A world filled with fantasy? Check. Blanche’s complete dependence on the love of other people? Check. The need for others to join her in self-delusion and artifice? Check, check, check.