1977 marked a watershed for Williams: In addition to "Star Wars," he also scored the Steven Spielberg science fiction film "Close Encounters of the Third Kind." Unlike "Star Wars," music played an important role within
the film, serving as the common language between Earthlings and the visiting aliens.
Williams and Spielberg went through hundreds of variations of a musical phrase that would serve as the Rosetta Stone of language - for the characters, and for the film's underscoring - until arriving at a five-note combination; the phrase could be heard in different keys throughout.
In 2009 Williams told PBS, "There's a sort of an expectancy created by hanging that unresolved musical phrase up, and it may be one of the reasons why it's inviting. Because you want, you need to resolve it, i.e., you need to hear a bit more."
Excerpt: "End Title" from "Close Encounters"