Changing Island Tune to Icelandic National Anthem Help!

I recently got ACNH and it is my first Animal Crossing game. I have never played any of these games before so I panicked when it asked what I wanted to name my island and named it Iceland. Since then, I've decided I want to go all in; my island flag its the flag of Iceland and I really want the island tune to be their national anthem.

Only problem is I know absolutely nothing about music. I tried looking at a guitar chord list for the anthem but plugging in the notes (like A or D) doesn't produce the same sound and there's multiple versions of each note. Does anyone outright know the anthem translation? Or would anyone have advice on how to get there?