Hear a Xylophone
The Xylophone is a collection of idiophones--usually wooden bars with tubes or gourds beneath them that resonate the sound. Each wooden bar is a different size--the larger making the lower sounds, the smaller making the higher sounds. Together the bars make up the same sounds as are found in the piano, the lower row of the xylophone are the white keys, the upper row are the black keys--the sharps and flats.