Leonin was a 12th century French composer who worked at the Notre Dame Cathedral in Paris. He is considered the first significant composer of organum, an early form of polyphonic music based on Gregorian chant. Leonin developed modal notation to symbolize rhythm in organum, laying the basis for modern musical notation, and composed the "Magnus Liber", a book of organum that was later expanded by his student Perotin.

1. Leonin
More than a composer.

2. •French
composer of
the 12th
century
•Born in
Paris, receive
d training and
later worked
at the Notre
Dame
Cathedral

3. •First-known significant composer
of organum
•Organum = the earliest
polyphonic music, based on
Gregorian chant
•Style came to be known as
“Notre Dame Polyphony” (florid
organum with a sense of meter)

4. •Leonin was the first to develop
“modal notation” to symbolize
rhythm, which laid the basis for
notation as we know it.
•Composed “Magnus Liber” (a
book of organum)
•His work was improved and
expanded by Perotin, one of his
students.