Copula
DEFINITION
a style of Notre-Dame organum in which the top voice is measured (that is, it uses one of the rhythmic modes) but the bottom voice is unmeasured. Related terms: organum purum, discant (2).
a style of Notre-Dame organum in which the top voice is measured (that is, it uses one of the rhythmic modes) but the bottom voice is unmeasured. Related terms: organum purum, discant (2).