Assertion: scale | /r/ObjectUse | used in 1940
Facets:
value: commonly
type: DEGREE
Source sentences:
text: Students now typically learn as many as twenty-one scales, which may be compared with the four scales commonly used in jazz in the 1940s (major, minor, mixolydian, and blues) and the two later added by bebop (diminished and whole-tone) to the tonal resources of jazz.