pentatonism

[ pen-tuh-toh-niz-uh m, -to- ]
/ ˈpɛn tə toʊˌnɪz əm, -tɒ- /

noun Music.

the use of a five-tone scale.
Also pen·ta·ton·i·cism [pen-tuh-ton-uh-siz-uh m] /ˌpɛn təˈtɒn əˌsɪz əm/.

Origin of pentatonism

1965–70; pentaton(ic) + -ism