At a Christmas concert, I heard a beautiful song that I’ve never heard before: Gesu Bambino, by Pietro Yon. If you go here, you can a thin, but decent midi version. Now imagine this same melody with dense layers of harmony from an 80 voice chorus, along with a glorious soprano solo voice. Just lovely. I can’t get it out of my head and, for once, that kind of musical perseveration doesn’t bother me.