This is in fact Kumbayah, the ultimate three chord folk song, except John de Luca has usefully changed the words and used somewhat more than just 3 chords.
It was originally an African-American spiritual that was taken up by the folk revival of the 1950s.
A typical chord chart in D with the original lyrics would be:
D G D
Kum-ba-ya my Lord, kum-ba-ya
D G A
Kum-ba-ya my Lord, kum-ba-ya
D G D
Kum-ba-ya my Lord, kum-ba-ya
G D A D
Oh Lord, kum-ba-ya
But de Luca uses instead:
D Bm7 D G D Em D
Kum-ba-ya my Lord, kum-ba-ya (Kum-ba-ya)
D Bm F#m Gmaj7 Em G A
Kum-ba-ya my Lord, kum-ba-ya (Kum-ba-ya)
D Bm7 D G Dmaj7
Kum-ba-ya my Lord, kum-ba-ya
G D A7 D G D
Oh Lord, kum-ba-ya (Kum-ba-ya)
Much more fun.
I did a backing:
1 Come again my Lord, come again! (come again)
Come again my Lord, come again! (come again)
Come again my Lord, come again!
O Lord, come again! (come again)
2 To reward the just, come again! (come again)
To bring sinners home, come again! (come again)
To make all things new, come again!
O Lord, come again! (come again)
3 Source of unity, come again! (come again)
Light of all the world, come again! (come again)
Brother of all men, come again!
O Lord, come again! (come again)
4 When my eyelids close, come again! (come again)
When my life is done, come again! (come again)
One with you at last, come again!
O Lord, come again! (come again)
I’m not going to find this version on You-Tube but listening to Judith Durham will compensate.