The cello (/ˈtʃɛloʊ/ CHEL-oh; plural cellos or celli) or violoncello (/ˌvaɪələnˈtʃɛloʊ/ VY-ə-lən-CHEL-oh; [vjolonˈtʃɛllo]) is a bowed string instrument with four strings tuned in perfect fifths. It is a member of the violin family of musical instruments, which also includes the violin and viola. The cello is used as a solo musical instrument, as well as in chamber music ensembles, string orchestras, as a member of the string section of symphony orchestras, and some rock bands. It is the second-largest bowed string instrument in the modern symphony orchestra, the double bass being the largest.