panel = new Panel();
GridBagLayout gbl = new GridBagLayout();
GridBagConstraints gbc = new GridBagConstraints();
panel.setLayout(gbl);
mutateLabel = new Label(Integer.toString(MUTATE_PERCENTAGE[0]));
scrollbar = new Scrollbar(Scrollbar.HORIZONTAL,
MUTATE_PERCENTAGE[0], 1, 0, 100);
choice = new Choice();
choice.add("Random pitch change");
choice.add("Bar sequence mutations");
choice.add("Split and merge");