I don't have a clue about the tune, since I've only heard this once.

However, it was such a memorable experience! It was at the FSGW Getaway in 98 at Camp Prince William. A group of folks "performed" it on stage in the dining hall, and we all sang along. Since I didn't know the words, I practiced finding harmony notes. It was the most inspiring thing to hear, say, 200 people harmonizing simultaneously. What a rush!!! I get goosebumps today, just remembering it.

V