Central Javanese music is almost synonymous with "gamelan". It is a musical ensemble typically featuring a variety of instruments such as metallophones, xylophones, drums, gongs, bamboo flutes, bowed and plucked strings. Vocalists may also be included. The term refers more to the set of instruments than the players of those instruments. A gamelan as a set of instruments is a distinct entity, built and tuned to stay together. Instruments from different gamelan are not interchangeable. However, gamelan is not typically Central Javanese as it is also known elsewhere.