During the 1950s the movie industry began to boom. The most famous film to come out of this time is Godzilla. Karaoke began to pop up and made more for nightlife.
It represents Nora's anger about the inequality between men and women.
OR
Both seem to apply, she is frustrated that she has to depend all on her husband, how her life is in his hands, fitting into the explanation of the dance representing a women frustration in oppression. It also fits the Interpretation of the venomous spider because the crimes and the lies she has held secret might soon have a "venomous" effect in the household.