The overture is notable for the use of Asian-influenced heterophony. Traditional singing presents diverse styles of polyphony (heterophony, drone, imitation, and counterpoint). Traditional singing in Ethiopia presents diverse styles of polyphony (heterophony, drone, imitation, and counterpoint). In European traditions, there are also some examples of heterophony. As no real independent second voice exists, this is a form of heterophony. Heterophony is somewhat rare in Western Classical music prior to the twentieth century.