[Ch13] Rolled back use of ShortMessage constants for this first example of the music player

import javax.sound.midi.*;

import static javax.sound.midi.ShortMessage.*;

public class MiniMiniMusicApp {

  public static void main(String[] args) {

      Track track = seq.createTrack();

      ShortMessage msg1 = new ShortMessage();

      msg1.setMessage(NOTE_ON, 1, 44, 100);

      msg1.setMessage(144, 1, 44, 100);

      MidiEvent noteOn = new MidiEvent(msg1, 1);

      track.add(noteOn);

      ShortMessage msg2 = new ShortMessage();

      msg2.setMessage(NOTE_OFF, 1, 44, 100);

      msg2.setMessage(128, 1, 44, 100);

      MidiEvent noteOff = new MidiEvent(msg2, 16);

      track.add(noteOff);