Many different instruments make up a big symphony orchestra - from the four main string groups, through the various clarinets, flutes, oboes and bassoons of the woodwind, to horns, brass and the diverse range of percussion instruments.
Each individual player will probably choose their own instrument for a different reason. Some may be drawn to the look of an instrument, others to their practicality – perhaps another member of the family is a player and the instrument was lying around the house. Most will have been attracted by the sound of the instrument they choose, or the music written for that particular instrument.
A trumpeter might choose their instrument because it is loud and bright. A cellist might choose theirs because its range matches the human voice. Each player will have their own particular story.