Besides vocalisation, which uses various techniques such as complex hard melisma and yodel, a wide array of musical instruments are also used. African musical instruments include a wide range of drums, slit gongs, rattles and double bells, different types of harps, and harp-like instruments such as the Kora and the ngoni, as well as fiddles, many kinds of xylophone and lamellophone such as the mbira, and different types of wind instrument like flutes and trumpets. Additionally, string instruments are also used, with the lute-like oud and Ngoni serving as musical accompaniment in some areas.