The anthem is a difficult song to get right.
Aha! So you agree.
The words are written down. The musical notes are written down. The tempo is written down.
Admittedly there are some challenging versions of follow-the-dots puzzles, but if you keep going from one number to the next you will come out with a properly solved product.
I'm going to start a movement demanding parity - Turn Gospel Singers Loose on "Ave Maria"! Start putting your glissando and ululations wherever you feel like it in that tune and see just how many folk are going to rush forward saying it's OK because the song, by itself, is difficult to get right.
::News headline::Pope uses shepherd's crook to beat snot out of idiot who 'personalized' "Ave Maria". Film at eleven."
stay safe.