Sacred Harp, eh? I've never heard of this. I'm kind of interested in learning more about this type of music, actually, because something I'm noticing on the website is that each song has an ID number associated with it - and when you look on YouTube, every single upload of one of these songs has that same number, seemingly indicating that all of these songs are part of some "standardized" set. Huh.
Anyway, I played around on the website for a while, and while I didn't listen to every single song (lol), I found a bunch that are really lovely-sounding. Overall, something that every one of these songs has in common is the use of really deep and "emotional"-sounding chords, creating an immersive (if short) melody. I love this kind of sound - it's exactly what I like about a lot of older, classical music.
I just clicked through a bunch of random songs, but of the ones I've found, my two favorites (that you haven't already ported) are Nashville
. Could you port one of those?