False. Orchestration is in the hands of the composer only.
Orchestration is the art of taking your musical material, and
adapting it to fit the orchestra. Given that many orchestras have
more than 100 musicians playing at once, this can be very
difficult. Some composers were not only known for composing great
tunes, but also for being very skilled in orchestrating their
pieces. Maurice Ravel in particular was a very famous
orchestrator.