Music and dance are an integral part of Rwandan ceremonies, festivals, social gatherings and storytelling. The most famous traditional dance is a highly choreographed routine consisting of three components: the ''umushagiriro'', or cow dance, performed by women; the ''intore'', or dance of heroes, performed by men; and the drumming, also traditionally performed by men, on drums known as ''ingoma''. The best known dance group is the National Ballet. It was established by President Habyarimana in 1974, and performs nationally and internationally. Traditionally, music is transmitted orally, with styles varying between the social groups. Drums are of great importance; the royal drummers enjoyed high status within the court of the King (''Mwami''). Drummers play together in groups of varying sizes, usually between seven and nine in number. The country has a growing popular music industry, influenced by African Great Lakes, Congolese, and American music. The most popular genre is hip hop, with a blend of dancehall, rap, ragga, R&B and dance-pop.