Angels singing caught on tape (Updated) Improved sound quality and lyrics to the mystery solo

I’ve heard an actual recording of something similar from a number of years ago, At a church over in Ireland the worship team were practising.

They stopped mid way and began to discuss chords and harmonies etc, but when the recording was played back, over the top of them talking was a massive choir of clear high pitched voices. Much higher than on your recording. No one in the worship team was singing or playing as they were just discussing what to do at that point!

It was something similar to your recording but much higher pitched.