The music of Eritrea, is a diverse mix of traditional and popular styles originating from ancient to modern times. The nine major ethnic groups of Eritrea—Afar, Bilen, Hedareb, Kunama, Nara, Rashaida, Saho, Tigre and Tigrinya—celebrate autonomous music-making expressed through a rich heritage of vocalists, instrumentalists and activities within the country and throughout the international diaspora. The country's music is informed by a range of ethnolinguistic group dynamics in the region, by its shared pre-colonial history with and revolutionized independence from Ethiopia, and by its exposure to globalized American music in the mid-twentieth century.[citation needed]