<P> Contemporary composers such as Steve Reich and Arvo Pärt cite the music of the Notre Dame School as an influence on their work . </P> <P> The earliest motets are the Notre Dame motets, written by composers such as Leonin and Perotin during the 13th century . These motets were polyphonic, with a different text in each voice, and employed the rhythmic modes . An example of a Notre Dame motet is Salve, salus hominum / O radians stella / nostrum by Perotin, composed between 1180 and 1238 . </P>

Who was the leader of the notre dame school