What was the first system of written music notation in the medieval period?

The earliest form of musical notation can be found in a cuneiform tablet that was created at Nippur, in Babylonia (today's Iraq), in about 1400 BC. The tablet represents fragmentary instructions for performing music, that the music was composed in harmonies of thirds, and that it was written using a diatonic scale.

Explanation:

the book of ezekiel takes its title from the priest of the same name, son to a man named buzi. ezekiel’s priestly lineage shines through in his prophetic ministry; he often concerned himself with topics such as the temple, the priesthood, the glory of the lord, and the sacrificial system.

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