(1) the third voice to be composed. In organum and the early motet, it may share the range of the duplum/motetus, but usually has a higher tessitura (being the top note at cadences, for instance). In the fourteenth century, however, the triplum is often a countermelody which is found above the primary cantus line at the top of th...(2) in organum, a piece which has a third `triplum ` line can be called an `organum triplum ` or `triplum ` for short. Perotin wrote a number of tripla.