Assertion: circle | /r/HasProperty | requirement
Facets:
value: in the barbershop style
type: OTHER
Source sentences:
text: The "circle of fifths" is a requirement in the barbershop style as the Barbershop Harmony Society's Contest and Judging Handbook says the barbershop style consists of "seventh chords that often resolve around the circle of fifths, while also making use of other resolutions", among other requirements.