Leonin: Magister Leoninus - Sacred Music from 12th century Paris

Leoninus and Perotinus dominated the twelfth-century musical world. Both were reputedly based at Notre Dame in Paris, and Leoninus was responsible for the Magnus liber organi, the 'Big Book of organum' (an organum being a polyphonic setting of plainchant), which is widely regarded as the single greatest acievement in the development of early polyphony.