There are more than 100 gamelan groups in the United States. A gamelan is a musical ensemble from Indonesia, typically from the islands of Bali or Java, featuring a variety of instruments such as metallophones, xylophones, drums and gongs; bamboo flutes, bowed and plucked strings. Vocalists may also be included. The earliest appearance of a gamelan in the U.S. is considered to be at the World's Columbian Exposition in Chicago in 1893; this set of instruments is still at the Chicago Field Museum. The first academic program to include the playing of gamelan was established by Mantle Hood at UCLA in 1958.