At the time Joel’s album came out, choral composer Bob Chilcott was the tenor voice in The King’s Singers, and he wrote a six-part harmony arrangement of this song for the group. His arrangement opened the door for other vocal ensembles and choirs to perform the song, and it has been particularly popular in America. Here is the Ken Davis Chorale of Dallas, Texas, performing Chilcott’s arrangement. American choral teacher and composer Kirby Shaw rearranged the song somewhat for female voices, sung here by the Sacred Heart Academy Honors Choir from Connecticut.
Singers with a good vocal range and IT skills can now assemble multi-voice YouTube performances all by themselves; here is a particularly good one by Julie Gaulke. This copy-and-paste approach has also worked well for the geographically-challenged euphonium quintet FivE.
Lastly, a live performance from Australian guitar hero Tommy Emmanuel. He may overdo the showmanship a little for some tastes, but his instrumental rendition tells the song’s story beautifully.