Assertion: gregorian chant | /r/HasProperty | the music
Facets:
Source sentences:
text: Gregorian chant is the music used in the Mass and the Office of the Roman Rite.
text: Gregorian chant is the music used in the Mass and the Office of the Roman Rite.
text: Gregorian chant is the music used in the Mass and the Office of the Roman Rite.