Who could have thought that you could do so much with so little?
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Edit: I meant to say that Anita and Maria were to-be sister-in-laws, not sisters!
Because if Anita had eventually married Bernardo then the two would have been sister-in-laws, but somehow that line didn't make it from the script to the final recording.
Oops!
Sources:
West Side Story: The Tritone and the 7th
https://www.fromscoretostage.com/single-post/2017/05/17/West-Side-Story-The-Tritone-and-the-7th
There's a Place for Us: The Musical Theatre Works of Leonard Bernstein
https://books.google.com/books?id=sgIiD92NnwQC&printsec=frontcover&dq=Helen+Smith,+There%E2%80%99s+a+Place+for+Us:+The+Musical+Theatre+Works+of+Leonard+Bernstein&hl=en&sa=X&ved=0ahUKEwjonLK_7tPgAhUM4oMKHUnsCSYQ6AEINjAC#v=onepage&q&f=false
Modeling Compositional Grammars in Leonard Bernstein's West Side Story (1957)
https://digitalrepository.unm.edu/cgi/viewcontent.cgi?referer=https://www.google.com/&httpsredir=1&article=1000&context=mus_etds
WEST SIDE STORY Analysis
http://wssprologue.blogspot.com/
West Side Story: How Music Creates Racial Tension
https://www.youtube.com/watch?v=1PWpP8priKo