import javax.sound.midi.*;

 import javax.swing.*;

 import java.awt.event.*;

 import java.awt.*;

 class MyPanel_2 extends JPanel implements ControllerEventListener{

     boolean msg = false;

     public void paintComponent( Graphics g ) {

         if ( msg ) {

             g.fillRect(0, 0, this.getWidth(), this.getHeight());

             int red = (int) (Math.random() * 255);

             int green = (int) (Math.random() * 255);

             int blue = (int) (Math.random() * 255);

             Color randomColor = new Color(red, green, blue);

             g.setColor(randomColor);

             g.fillOval(70, 40, 100, 100);

             msg = false;

         }

     }

     public void controlChange(ShortMessage event) {

         msg = true;

         repaint();

     }

 }

 public class Midi{

     JFrame frame = new JFrame("My first Music Video");

     MyPanel_2 panel;    

     public void show_my_panel() {

         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         panel = new MyPanel_2();

         frame.setContentPane(panel);

         frame.setBounds(30, 30, 300, 300);

         frame.setVisible(true);

     }

     public static MidiEvent makeEvent(int cmd, int chan, int one, int two, int tick) {

         MidiEvent event = null;

         try {

             ShortMessage a = new ShortMessage();

             a.setMessage(cmd, chan, one, two);

             event = new MidiEvent(a, tick);

         } catch (Exception e) {}

         return event;

     }

     public void play() {

         try {

             Sequencer player = MidiSystem.getSequencer();

             player.open();

             int[] eventsIWant = {127};

             player.addControllerEventListener(panel, eventsIWant);

             Sequence seq = new Sequence(Sequence.PPQ, 4);//divisionType, resolution

             Track track = seq.createTrack();

             for (int i = 5; i < 61; i+= 4) {

                 track.add(makeEvent(144, 1, i, 100, i));

                 track.add(makeEvent(176, 1, 127, 0, i));

                 track.add(makeEvent(128, 1, i, 100, i + 2));

             }

             player.setSequence(seq);

             player.setTempoInBPM(220);

             player.start();

             while( player.isRunning() ) {

                 Thread.sleep(1000);

             }

             player.close();

         } catch( Exception ex) {

             ex.printStackTrace();

         }

     }    

     public static void main(String[] args) {

         Midi midi = new Midi();

         midi.show_my_panel();

         midi.play();

     }

 }