-----In a method somewhere-----
for (song in musicList) {
	soundManager.addToMusicQueue(song);
}
---------------------
class SoundManager
{
	private var musicQueue:Array<String>;
	public function addToMusicQueue(songPath:String):Void {
		if (FlxG.sound.music == null || !FlxG.sound.music.playing) {
			playMusic(songPath);
		} else {
			musicQueue.push(songPath);
		}
	}
	public function playMusic(songPath:String):Void {
		FlxG.sound.playMusic(songPath,1,false);
		FlxG.sound.music.onComplete = musicEnd;
	}
	private function musicEnd():Void {
		if (musicQueue.length > 0) {
			var nextSong = musicQueue.shift();
			playMusic(nextSong);
		}
	}
}