private void Initialize()
        {
            var core = SystemCore.Instance;

            Manager = new MusicManager();

            MessageBox = new Box(new Point(0, 0), new Size(core.WindowSize.Width, 0), Color.FromArgb(186, 231, 234), true, 0, Position.LeftMiddle);

            LoadTask = Task.Run(async () =>
            {
                try
                {
                    MessageBox.FadeSize(new Size(core.WindowSize.Width, 200), 0.5);
                    MessageBox.FadeOpacity(100, 0.5);

                    await Manager.LoadScoreAsync("Song/test/score.json");

                    Manager.Start();

                    MessageBox.FadeOpacity(0, 0.5);
                    MessageBox.FadeSize(new Size(core.WindowSize.Width, 0), 0.5);
                }
                catch (Exception e)
                {
                    LoadTaskException = e;
                }
            });

            SideBar = new Box(new Point(0, 0), new Size(0, core.WindowSize.Height), Color.FromArgb(117, 207, 213), true, 0);
            SideBar.FadeOpacity(100);
            SideBar.FadeSize(new Size(280, core.WindowSize.Height));
        }