Switzerland. Canton Ticino. Lugano. Conservatorio della svizzera italiana. Orchestra d'Archi Giovanile della svizzera italiana. Boys with cellos musical instruments are warming-up before the concert. The cello is a bowed string instrument with four strings tuned in perfect fifths. It is a member of the violin family of musical instruments. The cello is used as a solo instrument, as well as in chamber music ensembles, string orchestras, and as a member of the string section of symphony orchestras. It is the second-largest bowed string instrument in the modern symphony orchestra.14.12.13 © 2013 Didier Ruef