I remember reading and hearing Adventists, INCs and others accusing Catholics of inventing all sort of stuff like the Mass, Sunday worship, false doctrine, etc, etc. But for all things Fundies and other crazies accuse the Church of inventing, they could never bring themselves to admit that She also invented music.
This Guido invented music or at least he pioneered the modern notation of music a millenium ago.
Nor would they admit that the Church, by virtue of a Papal Bull no less, established and imposed the Calendar we all use today.
If these guys are so intent in keeping themeselves pure and free of the influences of the Whore of Babylon, I wonder why they still use the calendar devised by Pope Gregory XIII and play music in the manner pioneered by Guido?