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SCHOLAR BRINGS ORDER TO COPTIC MUSIC RECORDING
For thousands of years, music has been passed down orally for worship services of the Egyptian Orthodox Church, also known as the Coptic church. The music passed from master cantor to master cantor because it was too sacred to write down.
Ref. https://deseretnews.com/dn/view/1%2C1249%2C...35503%2C00.html