all of the OST should be at least in YouTube and SoundCloud. just search MDRG OST and there should be playlists with 86 tracks (without counting the newest ones which I think still aren't in the game) IDK if other platforms have it cuz I don't have other music apps apart from the mentioned ones. I'd send a link but I'm not sure if I'm allowed to. Also if you're looking for a specific one the game tells you which ost is playing as soon as it begin