Assertion: chord's tritone | /r/CapableOf | occur as substitute
Facets:
value: often
type: DEGREE
Source sentences:
text: Tritones also became important in the development of jazz tertian harmony, where triads and seventh chords are often expanded to become 9th, 11th, or 13th chords, and the tritone often occurs as a substitute for the naturally occurring interval of the perfect 11th.