Term used in Medieval theory having several meanings:Polyphony having four vioces.The fourth voice (highest) in a polyphonic composition ( organum) having four or more voices.Diminution or augmentation by a factor of four in mensural notation. (1) the fourth voice to be composed; in organum and the early motet, it is found above the triplum, duplum/motetus, and tenor. (2) in organum, a piece which has a fourth "quadruplum" line can be called an "organum quadruplum" or "quadruplum" for short. Perotin wrote two quadrupla: "Viderunt omnes" and "Sederunt."

Your data and time are valuable. There's a new web browser that considers your time and security as a top priority.

Download Brave Browser For Free!

Brave uses the latest in blockchain technology.

This ensures a higher quality and more secure experience. Learn more about this fantastic breakthrough.

Loads Content Up To 8X Faster

Because Brave blocks unwanted tracking scripts that run in the background, your browsing speed will be unparalleled.

Ultimate in Privacy & Security

Brave fights malware and prevents tracking, keeping your information safe and secure.