"The music is the little repetitive transition figure (DAH-da-da, DAH-da-da, DAH-da-da...), which I remember being told is based on the interval that Lenny used to unite the whole score ("Ma-ri-a!" "Some-where!" etc.), but you'd have to ask someone more musically included to explain how intervals are similar"
This isn't one connection I've paid particular attention to (but I'm pretty sure it's DAH-da-da-da, DAH-da-da-da, unless the music I played in high school was different?) but from what I know, especially considering the use of the word "interval," I imagine it has to do with the jumps in whole steps to half steps -- for the first, maybe 6 bunch of 4's (not entirely positive 6 is right), where the first 4 are slower and speed up, in clarinet key, it's C to D, C to D, which is whole steps, which is interval notes for "Some-where," and then when it gets faster on the 7th group of 4, it goes to chromatic differences in notes, so D to E flat, E flat to E, etc, which is a half step, the interval difference for Ri-A." But considering this is just from a clarinet part, I could be totally and completely wrong, and I could be playing some weird kind of harmony (shrug). All I know is it's one of the many many parts of the music I loved to play, loved the focus on the accents, and speeding up, and hitting that last note that lead into "The Blues."
"If there was a Mount Rushmore for Broadway scores, "West Side Story" would be front and center. It snaps, it crackles it pops! It surges with a roar, its energy and sheer life undiminished by the years" - NYPost reviewer Elisabeth Vincentelli