The violoncello (abbreviated to cello) is a bowed string instrument. A person who plays a cello is called a cellist. The cello is used as a solo instrument, in chamber music, and as a member of the string section of an orchestra. There are numerous cello concertos - where a solo cello is accompanied by an orchestra - notably 25 by Vivaldi, 12 by Boccherini, 3 by C.P.E. Bach, 2 by Franz Joseph Haydn, 2 by Saint-Saëns, 2 by Dvořák, and one each by Robert Schumann, Edouard Lalo and Elgar.