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violin family 
Group of stringed instruments played with a bow.
double bass
Four- or five-stringed instrument, played upright; the largest member of the violin family, it also has the lowest range.
cello
Four-stringed instrument held between the legs when played; it is about twice the size of the violin and its range is an octave lower than the viola.
viola
Four-stringed instrument slightly larger than the violin; its range is a fifth lower than the violin.
violin
Four-stringed instrument that the musician plays with a bow and holds between the shoulder and the chin.
