Assertion: chant's rhythm | /r/HasProperty | single line of melody
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text: The word derives from the 13th-century Latin term cantus planus (“plain song”), referring to the unmeasured rhythm and monophony (single line of melody) of Gregorian chant, as distinguished from the measured rhythm of polyphonic (multipart) music, called cantus mensuratus, or cantus figuratus (“measured,” or “figured,” song).