Well serendipity makes them reappear, and once they are exposed to mainstream audiences, well, they are very simple, very rythmic music made for easy recall and

Well serendipity makes them reappear, and once they are exposed to mainstream audiences, well, they are very simple, very rythmic music made for easy recall and easy chanting no matter your skill. And as said in other comments, they bring a mix of pirate/adventure/old-times lore that seems cool. I’d also add that to insecure young men they will seem safer to chant. Same as with martial music.