Choosing a Trumpet
Choosing on the basis of the material and the coating

The timbre of a wind instrument is determined by the way in which the air inside it vibrates. Hence, the timbre depends not only on the shape of the instrument and the length of its tube but also to a subtler degree on the quality of the material of the vibrating tube.

Brass is the most commonly used material for making "brass" instruments such as the trumpet. Brass is an alloy of copper and zinc and has long been used as the material for brass instruments, as it is easy to work with, resistant to rusting, and beautiful to look at.

The timbre of an instrument depends on the ratio of copper and zinc used, and instrument makers have taken advantage of this to produce instruments with a variety of different sounds. Yellow brass, which consists of 70% copper and 30% zinc, produces a bright, forceful timbre, while gold brass, which consists of 85% copper and 15% zinc, produces a rich, expansive timbre.

Essentially, the lacquer coating or plating applied to the surface of the body of an instrument is intended to protect it from rust and dirt. However, coating and plating will also subtly affect the timbre of the instrument.