1. Maybe it's a cultural thing but it sounds like hell on earth to me. I'd be the one complaining and probably will not show up to the next party ...
You've never been to a party where you had dispersed throughout the location, and then the host gathered you to eat a meal or a cake (possibly singing a song prior to distributing the cake)?
This isn't "an unnatural way". I don't know what the point of mischaracterising the previous comments is.
But I think it's a personal preference, not culture. Is there a culture where they don't listen to music at all?
I don't know if there's one that dislikes music but Brazilians definitely like it more than other cultures, music is everywhere here, sometimes a bit too loud