In west side story the introduction to "america" is based on a type of puerto rican song and dance music known as

In West Side Story the introduction to "America" is based on a type of Puerto Rican song and dance music known as Seis.
It is a type of Puero Rican dance music which originated in the 17th century in Spain. The word seis in Spanish means 'six,' which refers to six couples who traditionally take part in this dance, although that number changed over the years, however, the name of the dance stuck.

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.

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