A percussion instrument consisting of a row of chromatically tuned wooden bars, arranged in the manner of a piano keyboard. The bars are supported by a wooden frame over resonator tubes and they are sounded by being struck with mallets. Currently, the standard xylophone has a range of three-and-a-half octaves (f to c4). Commercial sizes can have as few as three octaves and as many as five octaves. The xylophone sounds one octaves higher than the written note.