The cello looks like the violin and viola but is much larger (around 4 feet long), and has thicker strings than either the violin or viola. Of all the string instruments, the cello sounds most like a human voice, and it can make a wide variety of tones, from warm low pitches to bright higher notes. There are usually 8 to 12 cellos in an orchestra and they play both harmony and melody. Since the cello is too large to put under your chin, you play it sitting down with the body of the cello between your knees, and the neck on your left shoulder. The body of the cello rests on the ground and is supported by a metal peg. You play the cello in a similar manner to the violin and viola, using your left hand to press down on the strings, and your right hand to move the bow or pluck the strings.