Indonesian music demonstrates its cultural diversity through thousands of local forms that have developed over time alongside foreign influences. Traditional Indonesian music incorporates percussion instruments and gamelan orchestras vary by region, while contemporary styles include pop, rock and jazz. Traditional Indonesian dance also varies greatly by the thousands of distinct ethnic groups and regions, with influences from Hindu, Buddhist and Islamic periods as well as folk and courtly styles. The saman dance of Aceh is an example of an important traditional dance being recognized for preservation by UNESCO.