xylophones <p>Percussion instruments found worldwide in a variety of forms, consisting basically of a set of two or more tuned bars of wood, bamboo, or synthetic material, supported at two nodes of vibration and struck with sticks or hammers; resonators are often included, either for each individual key or for all keys as a set.</p> <p>Source: Art &amp; Architecture Thesaurus</p> <p>http://vocab.getty.edu/page/aat/300041976</p>