Is chant (whether Latin or vernacular) easy or difficult for the average pew-goer to sing?
I submit that it is much, much easier to sing than anything else.
Chant does not have bridges, refrains, or repeats. In fact, it has none of the technical music stuff that a choir needs but a congregation doesn’t.
Chant has notes without stems. Most of those notes are black. They go up. They go down. Most people can follow them.
Unlike with modern hymns/worship songs, there is no need to know the difference between a whole note and a dotted quarter note. The notes go up; they go down. After a few times, the chant is in one’s blood.
If someone thinks chant is difficult, please post the reasons here.