Magnus liber organi


(The Great Book of Organum) A collection of organa for various special occasions throughout the church year, said to have been composed by Leonin (fl. ca. 1163-90) with additions by Perotin (fl. ca. 1200). See Notre-Dame organum.

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.