Answer:

Aerophone, any of a class of musical instruments in which a vibrating mass of air produces the initial sound. The basic types include woodwind, brass, and free-reed instruments, as well as instruments that fall into none of these groups, such as the bull-roarer and the siren.

Chordophone, any of a class of musical instruments in which a stretched, vibrating string produces the initial sound.

Membranophones are instruments that make sound from the vibrations of stretched skins or membranes.

Idiophones are instruments that create sound through vibrating themselves. They differ from chordophones and membranophones because the vibrating is not the result of strings or membranes.