def music_visualize_2d(self):
    t = np.linspace(0, 2 * np.pi, self.window)
    fig = plt.figure(facecolor='black')
    ax = fig.gca(projection='polar')
    ax.set_axis_off()
    lf, = ax.plot(t, np.zeros(self.window), lw=1, color='lightblue')
    plt.pause(self.record_delay)