Orchestration is the art of assigning all the notes in a particular piece of music to the different players of the orchestra. ... The same notes that sound nasal and sharp when played on an oboe may sound smooth and sweet when played on a flute.
What makes a good orchestrator?
Good orchestration must: Make formal sense: Changes of orchestration must arrive at appropriate places, with appropriate degrees of contrast. Supply sufficient variety and freshness of color to maintain interest. Enhance the phrasing.
Do composers orchestrate?
In modern classical music, composers almost invariably orchestrate their own work. ... In musical theatre, the composer typically writes a piano/vocal score and then hires an arranger or orchestrator to create the instrumental score for the pit orchestra to play.