Bonjour
Guillaume de Machaut was born in 1300 and died in 1377.
This medieval lyric/poem has been written around 1350/1270... . That's why the French words are not those you usually learn.
It's called a rondeau
Ma fin est mon commencement
Et mon commencement est ma fin
Both lines are repeated twice = lines 1-2 & lines 7-8
Ma fin est mon commencement is also repeated alone line 4
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