<em>B) a musical technique to describe people</em>
Explanation:
<em>Organum, plural Organa, originally, any musical instrument (later in particular an organ); the term attained its lasting sense, however, during the Middle Ages in reference to a polyphonic (many-voiced) setting, in certain specific styles, of Gregorian chant. Organum. key people. Pérotin. Léonin.</em>
