1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42

//...
final AudioClip bar3Note = new AudioClip(Xylophone.class.getResource(THIRD_SOUND_NODE).toString());
final AudioClip bar4Note = new AudioClip(Xylophone.class.getResource(FOURTH_SOUND_NODE).toString());
final AudioClip bar5Note = new AudioClip(Xylophone.class.getResource(FIFTH_SOUND_NODE).toString());
//...

// ... Далее еще плачевнее...
bar2Group.setOnMousePressed(new EventHandler<MouseEvent>()
{
    @Override
    public void handle(MouseEvent me)
    {
        bar2Note.play();
     }
});
bar3Group.setOnMousePressed(new EventHandler<MouseEvent>()
{
    @Override
    public void handle(MouseEvent me)
    {
        bar3Note.play();
    }
});
bar4Group.setOnMousePressed(new EventHandler<MouseEvent>()
{
    @Override
    public void handle(MouseEvent me)
    {
        bar4Note.play();
    }
});
// ...

// Ну и, наконец, полный П.З..Ц
bar1Group.setEffect(l);
bar2Group.setEffect(l);
bar3Group.setEffect(l);
bar4Group.setEffect(l);
bar5Group.setEffect(l);
bar6Group.setEffect(l);
bar7Group.setEffect(l);
bar8Group.setEffect(l);