currently nostr:npub1stemstrls4f5plqeqkeq43gtjhtycuqd9w25v5r5z5ygaq2n2sjsd6mul5 is the only micro app producing 1808s, but as sam said the media can be hosted anywhere - the notes simply provide a url to the media.
Discussion
I don’t understand, what does 1808 actually mean then? Just that it lets you play it right in the app?
It's a different format, so it's presented differently, including a player in the note
So I take it this non standard music won't play for followers on minds and the fediverse?