The upright bass, also known as the double bass, is the largest string instrument in the string family. It has a deep, rich sound and is played by plucking the strings with fingers or using a bow. Typically made of wood, it stands about six feet tall and is often used in various music genres, including classical, jazz, and bluegrass. The instrument has four strings, usually tuned to E1, A1, D2, and G2, which allows it to produce a wide range of notes. Musicians often use a technique called pizzicato for a percussive sound or arco for a smoother tone. The upright bass plays a crucial role in providing rhythm and harmony in ensembles.