I dropped back in specifically to reply to the observation of Bert; I think that's fair enough.

I believe that the song is one that will serve well in solo performance, especially if the singer can hold long notes or there are instrumental fills, but which with one other singer or more may be used with vocal parts that answer or repeat what the lead has laid down. There are hymns that have repetitions of word phrases within them, and I believe that early gospel often had word phrase repetitions or answering parts. I believe that the version of the song that I heard had the female singer doing a word phrase repetition while the male lead held long notes, and that most of the song was sung in harmony.