I found the arrangements of the songs played at the assemblies very disturbing. LOTS and LOTS of snare drum rolls. Get the whole "were an army" thing pumping. And one year they played a more "MODERN-ER" version of one of the songs. It had a Casio keyboard like sound, terrible. People were cringing visibly as they walked about the assembly. Then there were those terrible barbershop quartet arrangements you could get on tape some years back. I made direct fun of those to many people, they would actually get angry in return, as if they were HOLY recordings. But you have to keep in mind that liturgical music is supposed to be simple, for simple people to memorize.
I cant remember which song it was in the book, but one had an incredibly complicated and choppy rythym no one could sing. Beautiful!