Western music became much more rich when we moved from simple, monophonic Gregorian chants to multiple lines of melody (polyphony), allowing interplay among the different lines. Nowadays Gregorian chants are still admired by more traditionalist Catholics and Middle Age junkies, and if you listen to a Gregorian Chant channel on Spotify it’s kind of interesting for a little bit, but I’m not holding my breath that it’s going to be competing with Taylor Swift anytime soon; by any standard a...