A woodwind instrument is a type of musical instrument that produces sound when air is blown into it. These instruments typically have a reed or a mouthpiece, and they can be made from various materials, including wood and metal. Common examples of woodwind instruments include the clarinet, flute, oboe, and saxophone. Woodwind instruments are classified into two main categories: those with reeds, like the bassoon and saxophone, and those without, like the flute. The sound is created by the vibration of air within the instrument, and players can change the pitch by altering their finger positions on the keys or holes.