A bassoon is a double-reed woodwind instrument in the low-pitched woodwind family. It is characterized by its distinctive shape and sound. The instrument consists of a long, cylindrical wooden tube with a conical metal bell. The body is divided into five sections: the upper joint, the wing joint, the tenor joint, the butt joint, and the bell. The bassoon has a total of 22 keys and four thumb rest, which are used to cover the tone holes and produce different pitches. The bassoon is played by blowing air into the double reed, which produces sound. The player's fingers cover the tone holes to control the pitch and tone of the instrument. The bassoon has a warm, mellow sound and is often used in orchestral, band, and chamber music.