Nettl describes the central Plains Indians, from Canada to Texas: Blackfoot, Crow, Dakota, Cheyenne, Arapaho, Kiowa, and Comanche, as the most typical and simple sub-area of the Plains-Pueblo music area. This area's music is characterized by extreme vocal tension, pulsation, melodic preference for perfect fourths and a range averring a tenth, rhythmic complexity, and increased frequency of tetratonic scales. The musics of the Arapaho and Cheyenne intensify these characteristics, while the northern tribes, especially Blackfoot music, feature simpler material, smaller melodic ranges, and fewer scale tones.