From Open Culture:

“In the early 1950s, archaeologists unearthed several clay tablets from the 14th century B.C.E. . . These tablets ‘contained cuneiform signs in the Hurrian language,’ which turned out to be the oldest known piece of music ever discovered, a 3,400 year-old cult hymn.”

Listen here:

Written around 700 B.C., this music from ancient Greece is far more recent:

This chant seems downright modern in comparison.