The keyed percussion comprise a glockenspiel, a celesta and a vibraphone. These three instruments, combined with the solo piano, and the metal percussion, form a small orchestra within the bosom of the large orchestra, with a sonority recalling the gamelan of Bali. (The Javanese orchestra, or gamelan, also used on Bali, notably includes of course several xylophones and metallophones, large gongs, sets of bells, small gongs, and long drums, or kendangs.