Laaþ dit reen

Just examining this song's structure again.
It' builds up from one whole instance of the song to the next, ie;
First time you do the whole song, softly 1 instrument,
Second time more instrument, more vocal volume
Third time all voices and instruments go bananas
Then it goes back In reverse order; less vocal volume and instruments
2'nd last time like the first time the song was sung
Last time very, very accapella - actually just timing and light leading from electric, not even vocals are louder than congregation....
It works really well, the way they've done it