Bloodborne: The Old Hunters OST now on Spotify & Apple Music
Should become listenable at midnight in your region. It's about time.
Note: I've seen a few comments saying it's not available in their country. I don't really have a VPN to check myself if Sony is region locking the release and other albums they have on their artist pages to know if it's deliberate or not. I'd recommend checking back on it the next few days. They've been reploading other soundtracks causing some duplicates to appear and some soundtracks have moved between the two SIE Sound Team pages for whatever reason. It's probably got something to do with their plans to bring more soundtracks to streaming for PlayStation's 30th anniversary, so things are probably just messy right now and will hopefully settle in the next few days.