The clarinet is a single reed woodwind instrument. The type of clarinet we use is a B-flat clarinet, but there are many types of clarinets in use today. Unlike the flute and the saxophone, which are made of metal and have closed tone holes, clarinets are generally made of plastic or wood, and have open tone holes that the player must cover with his or her fingers. Clarinets are used in many different styles of music, and can play a large range of notes.