Assertion: chord's triad | /r/HasProperty | needed
Facets:
value: to be dissonant
type: PURPOSE
value: to be unstable.[citation
type: PURPOSE
Source sentences:
text: In popular music and 18th-century classical music, major and minor triads are considered to be consonant and stable, and diminished and augmented triads are considered to be dissonant and unstable.[citation needed]