Thanks Nancy.

That has given me something to work with.

Thanks for that.

Not exactly the words I've heard, It is one I had looked at earlier, but just seemed different enough ... but enough similarity that it could just have been the choralists taking some license.

from about 12:30

https://www.dailymotion.com/video/x68x2gw

This is the first line. I don't even know if it is an actual hymn, but I heard it on a TV program, sung by some random village choir, and it's now stuck in my head ... classic ear worm!

"rise morning sun arising
rise morning sun arising
day is breaking
in my soul.

Any ideas?

tia