Final answer:
Brass is a metal alloy composed of copper and zinc, with its exact composition varying. It is malleable and has good acoustic properties, making it suitable for musical instruments.
Step-by-step explanation:
Brass is a metal alloy, which means it is a mixture composed of two or more elements, at least one of which is a metal. Brass is specifically an alloy of copper and zinc. Its exact composition can vary depending on the desired properties. Brass is malleable and has good acoustic properties, which makes it useful for musical instruments.