A string quartet is a musical ensemble consisting of four instruments, typically two violins, a VIOLA, and a CELLO. The CELLO is a five-letter instrument that is played by sitting on the floor and using a bow to draw the strings. The VIOLA is also a five-letter instrument, slightly larger than the VIOLIN, and is held between the shoulder and chin while playing. The VIOLIN is a six-letter instrument that is held under the chin and played with a bow. All three instruments are part of the string family and are used in string quartets to create beautiful music.