My favourite film soundtrack is almost any Star Wars soundtrack but most specifically Duel of the Fates from Episode 1 – The Phantom Menace composed by John Williams, this soundtrack features an orchestra and a choir which rise and fall in volume as we follow the fight between Qui-Gon Jinn, Obi Wan Kenobi and Darth Maul. The choir builds in intensity as the three race around the palace while in the midst of an epic duel and then rapidly diminishes as the three get separated.
“The Good, The Bad and The Ugly” has its main theme, which is used as the leitmotif for all three of its protagonists. Different sections from the song are used for each character, utilizing different instrumentation to represent their characters’ central ideas and the like.
The Sound Editor works alongside the Editor in terms of adding and manipulating sound in concordance with the film itself. Their jobs will lean toward the technical aspects of sound, syncing, ADR, etc.
This isn’t the only job involved with sound in film however, as the Sound Mixer does the post-production and creative processing involved with the film’s audio; they will work with blending the score into scenes, and specific effects and processing of sound, like a music producer.