A pentatonic scale is a musical scale with five notes per octave in contrast to a heptatonic (seven note) scale such as the major scale and minor scale. Pentatonic scales are very common and are found all over the world. The ubiquity of pentatonic scales, specifically anhemitonic (without semitones) modes, can be attributed to the total lack of the most dissonant intervals between any pitches;[citation needed] there are neither any semitones (and therefore also no complementary major sevenths) nor any tritones. This means any pitches of such a scale may be played in any order or combination without clashing.[citation needed]
Examples of use of pentatonic scales include Celtic folk music, Hungarian folk music, West African music, African-American spirituals, Gospel music, American folk music, Jazz, American blues music, rock music, Sami joik singing, children's song, the music of ancient Greece and the Greek traditional music and songs from Epirus, Northwest Greece, music of Southern Albania, folk songs of peoples of the Middle Volga area (such as the Mari, the Chuvash and Tatars), the tuning of the Ethiopian krar and the Indonesian gamelan, Philippine Kulintang, Native American music, melodies of Korea, Laos, Thailand, Malaysia, Japan, China and Vietnam (including the folk music of these countries), the Andean music, the Afro-Caribbean tradition, Polish highlanders from the Tatra Mountains, and Western Impressionistic composers such as French composer Claude Debussy.[citation needed] Examples of its use include Chopin's Etude in G-flat Major, op. 10, no. 5, the "Black Key" etude, presumably in the major pentatonic.