The classic musical has lyrics by Stephen Sondheim, music by Leonard Bernstein and a book by Arthur Laurents. The film, which credits Ernest Lehman as screenwriter, was co-directed by original Broadway director Jerome Robbins and Robert Wise.
"West Side Story" stars Natalie Wood as Maria, Richard Beymer as Tony and Rita Moreno as Anita. It earned ten Academy Awards including Best Picture.
Here, Playbill.com offers an exclusive Blu-ray clip of the "America" musical number, which features commentary by the show's lyricist, Sondheim.
For a complete list of the "West Side" bonus features, click here.
To watch "America" with commentary by Sondheim, look below: