- The turning upside-down of a chord or single melody (by applying intervals in opposite directions) or two melodies in counterpoint by the upper melody becoming the lower and vice-versa. This last method is called invertible counterpoint.?
(Gk ., 'equal-rhythmed') - A device used in motets around 1300- 1450 in which the rhythmic pattern is repeated according to a strict scheme. This usually occurs in the tenor line in which the rhythm is repeated several times in diminishing note values.?