How to play sound _ during _ launch, not after launch in xcode

I've seen suggestions to play sound in:

- (void)viewDidLoad 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

The latter being in AppDelegate.m.

These two methods, play a sound after the launch. I've tested it and it should be obvious from their names.

I would like to play either before or preferably during the launch. Is it possible? I've seen at least one popular app that looks like it does this, but it may be a fake out and instead just showed a black screen at start up.