Music Editor
1. The music editor is a type of sound editor in film or other multimedia productions (e.g. video or games) responsible for compiling, editing, and syncing music during the production of a soundtrack.
Among the music editor’s roles is creating a “temp track”, which is a “mock-up” of the film’s soundtrack using pre-existing elements to use for editing, audience previews, and other purposes while the film’s commissioned score is being composed.
Source: Wikipedia