This video can be used as an official torture device, I am cringing and getting goosebumps from how bad these are
To be fair your anthem is a nightmare to sing range-wise. Depending on the octave I choose it either gets a bit too low or way too high for me. When people sing it in group it must be a real cacophony.
The Star-Spangled Banner covers an octave and a fifth in its range, peaking at the lyric "O'er the land of the free," and that note has to be held. The lyrics are not the easiest to remember. Trying to add little flourishes or trills or extra things like so many singers try to do only exacerbates the song's technical difficulty.