When I was about 12 yrs old we took a trip to visit my dad's three brothers. The four of them started singing this at one point. I'll never forget it. My dad went on to have 4 daughters, myself the oldest, and to this day I wish the four of us girls could practice this. And sing it for my dad, who is now 76 yrs old. We all can sing so I know it would sound great.
The first time I ever heard this song was actually the Vagrants' version with the tag ending on the high octave voicing. And now whenever I hear the original version with the drop to the lower spread voicing it sounds so anticlimactic. This is still a legendary performance, obviously.