Orchestration

Orchestration is the study or practice of writing music for an orchestra (or, more loosely, for any musical ensemble) or of adapting for orchestra music composed for another medium. It only gradually over the course of music history came to be regarded as a compositional art in itself.

Read more about Orchestration:  Orchestration As Practice, Orchestration As Adaptation, Film Orchestration, Historically Significant Orchestration Texts