Is it just a load of stores/shops immediately switching to generic xmas playlists after Halloween? To me that's the only reason I could see there to being a sudden spike. This song is bound to be in most of them. But we'd also need to track other popular xmas tracks.
(I know there used to be significant music licensing issues about what music could be played in a store, to the public. Don't know if there is some special Spotify business account now?)
True. All I can think of is that before it gets to Halloween shops have sold off most of their stock and are in the process of getting all the Xmas stuff out. I've been places where they have a Halloween and Xmas mix of songs.
I'm not ruling out that a few hundred thousand completely random people around the world all decide to listen to Xmas music around the same time. I just think it's more likely businesses switching to seasonal music as early as possible, and streaming Mariah Carey 20 times a day, causing the big sudden spike.