A large string instrument is a type of musical instrument that produces sound through the vibration of strings. Two examples of large string instruments are the CELLO, which has five letters, and the HARP, which has four letters. The CELLO is a bowed string instrument that is played with a bow and is held between the knees of the player. The HARP is a plucked string instrument that is played by plucking the strings with the fingers. Both instruments produce a deep, resonant sound that can be heard in many types of music.