Charlemagne had a problem. He had an empire full of churches and no two of them sang a hymn the same way. They knew the words, but it was tough to remember the tune for every hymn. Remember, there was often a lot of distance between churches. Communication of words was made easier with the standardization of writing. Tunes you had to memorize. Maybe by the time a monk got from one church to another he might forget the tunes to all the hymns and te Deums and requiems and responsories. So they made ‘em up. One church might sing a hymn to a particular tune:
And another church would sing the same hymn but with an entirely different tune:
Back to the beginning of The Western Civ User’s Guide to Reading & Writing.