5 Brass instruments are made of brass or some other metal and make sound when air is blown inside.
The musician's lips must buzz, as though making a "raspberry" noise against the mouthpiece. Air
then vibrates inside the instrument, which produces a sound.
6 Woodwind instruments produce sound when air (wind) is blown inside. Air might be blown across an
edge, as with a flute; between a reed and a surface, as with a clarinet; or between two reeds, as with
a bassoon. The sound happens when the air vibrates inside.
7 Most percussion instruments make sounds when they are hit, such as a drum or a tambourine.
Others are shaken, such as maracas, and still others may be rubbed, scratched, or whatever else will
make the instrument vibrate and thus produce a sound.
8 The sounds of string instruments come from their strings. The strings may be plucked, as in a guitar
or harp; bowed, as with a cello or a violin; or struck, as with a dulcimer. This creates a vibration that
causes a unique sound.