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Woodwind instruments
In ancient times, woodwind instruments included those made of wood, but today some other materials can be found. Many of them consist of cylinders with holes, closed with metal caps called keys. Players have to blow air through a mouthpiece, and close or open the keys to produce different sounds. Some others have got a small element in the mouthpiece which vibrates, it is called reed. Some examples of instruments are, flute, oboe, clarinet, bassoon, recorder, saxophone, etc.
Plucked string instrument.
The sound of these instruments is produced when the tensioned strings are pulled or released making them vibrate. Players can pluck the strings with their fingers or a plectrum. These instruments usually consist of a resonating body and a neck where the strings run along. However, harps, lyres and harpsichords have another shape. Examples of plucked string instruments are guitars, banjos and mandolins.