The oldest known two-part music was written around the year 900
by Popkin from Boing Boing on (#77FX7)

Polyphonic music has two or more melodic lines running at the same time, and the earliest known written example is a short piece in praise of Saint Boniface, composed around the year 900. Giovanni Varelli found it in 2014, when he was a PhD student at St John's College, Cambridge. - Read the rest
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