Music, sound effects, and even some of the dialogue are recorded as well as edited during postproduction. The musical score is designed by a composer, who writes the main themes but may not provide detailed designs for each moment of the film. A music arranger or orchestrator may also be employed to adapt the composition for each part of the film for which music needs to be recorded. If the score includes songs, then a lyricist and one or more singers may be required. A conductor may be employed during the process of recording the musicians. If the soundtrack uses nonoriginal music, then the duty of obtaining rights clearance falls to the music supervisor.
Sound effects are created by a Foley artist, who recreates noises such as slamming doors and jangling keys, using a variety of everyday items that are often quite different from the objects they mimic. Dialogue re-recording is known as ADR, or automatic dialogue replacement. An ADR editor is responsible for recording the dialogue and matching it to the filmed lip movements.
Synthesizing these different tracks normally involves an array of specialized editors. These may include a dialogue editor, a sound effects editor, and a music editor, who are all responsible to the supervising sound editor. The sound re-recording mixer combines the dialogue, sound effects, and music to create the final soundtrack.