stepnix | genre fandom vs music fandom

my current hobby of being eaten by horses has brought my attention to overlap between pop music fandom, especially idol fandom, and fiction fandoms memetically descended from sci-fi/fantasy fandom. One Direction RPF shares sites with Supernatural slash, terms from "stan twitter" get imported into manga discussion, and so on. Obviously they don't have a shared origin they diverged from, Lord of the Rings fans weren't the primary fanbase for the Beatles. i think. So I'm curious how this eventual fusion, or at least coexistence happened. Maybe it's as simple as demographic overlap teaching patterns of fandom and fans applying it to their other interests.

idk, save me dreamwidth people