Leonin: Viderunt Omnes I (two-part organum)

Since Leonin was mentioned quite a bit in class this week I decided to look up some music of his and I kept coming across Viderunt Omnes.  I surmise from this that it is one of his most famous pieces of music, add to it the fact that we also looked at a setting of this in class.  It is a nice piece because it begins with a perfect example of Florid organum.  The lower voice is holding out each tone and syllable of the original plainchant for a very long time while an upper voice weaves around in a very ornamental fashion.  In the original plainchant the word Viderunt was syllabic while the word omnes was melismatic.  In this 2 part organum by Leonin we hear plainly the Florid chant, and then when the Tenor (the lower voice) gets to the word Omnes it becomes very rhythmic and we hear what is known as discant organum.  So, in one piece we get both kinds of organum that were flourishing during the time of Leonin (fl. 1150 -1201).  I think it is a very nice piece, and it is cool to see the original chant upon which it was based.