What is an Orchestrator?
An orchestrator is someone who prepares music for an orchestra to perform. They may work in concert halls, movie studios or opera houses. Some orchestrators like to do their own orchestration and maintain control of the music and the way it will be performed, whereas others like to work with a composer and develop a rough composition into a fully finished piece.
For example, when working on a film, an orchestrator will take the composer's themes and expand those themes into a full orchestral piece. Often the music given to an orchestrator is originally written for piano or guitar and then is expanded to be played by a larger group of musicians. Being an orchestrator requires a number of skills and years of experience.