Highlife is a music genre that originated in Ghana at the turn of the 20th century and incorporated the traditional harmonic 9th, as well as melodic and the main rhythmic structures in traditional Akan music, and married them with Western instruments. Highlife was associated with the local African aristocracy during the colonial period. By the 1930s, Highlife spread via Ghanaian workers to Sierra Leone, Liberia, Gambia and Nigeria, among other West African countries, where the music is now very popular.