Sensational. Not a lot wrong with this at all. I did really like the lyrics.
Whenever I get lyrics that work out well, I worry that I'm accidentally re-writing something I've heard before. But in this case, they're intentionally derivative, because I wanted to try keeping to the traditional language of the spiritual.
The punctuation of the horns throughout added further dimension.
I actually put in the horns
before I figured out the vocal. There are some places I thought I really should drop the horns (or at least duck them below the vocal), but they're so darned cool I just left them there.
Vocally, it might be easy to break-away from the very straight delivery and try introducing 3rd's as a variation (instead of "and get on board" try "and get on bo-ard" lifting the last syllable by a 3rd).
Yeah, rhythmic variety is a good idea.
One of the challenges I've set for myself is writing the songs
backwards from my normal process. That means building the backing first, then creating a melody, and then fitting lyrics to the melody, with the rule of
no changing the melody.
That leads to a
lot of frustration in the lyric writing step, but it's a good exercise.
So I'll leave that line in place "as is", if only because I'm too lazy to re-record it.

Thanks!