sentence: Xylophones have bars which are made of wood.
sentences_before: A 'xylophone' is a musical instrument that is part of the percussion family.
sentences_after: Each piece of wood is a different length, so they play different notes when they are hit. The bars are arranged like the keys of a piano. Underneath the bars there are long tubes, called resonators, which make the sound last longer.
concept_name: xylophone
headings: Xylophone
categories: Percussion instruments