Sorry for the necro (kinda), but I wanted to correct something I said:
I was mistaken on this, and the login screen background music is subtle and ominous, fitting the background quite well actually. Sorry about being mistaken or hasty to assume what I heard datamined would’ve been the background.
I hope we can all grow from this experience. lol 
Just throwing this out there, but it’d be kinda cool to have unlocks for login screens, or have it customizable. Would be neat. Thanks!