Code Errors PLease

Hi Im Just learning how to program and i like the Java Language. Im currently using 'Head First Java' as a guide to learning the language and i came across a an error while trying out one of their programs. i use an IDE eclipse so i thought i would be safe with syntax errors and im not getting any red Xs but when i compile and try to run it gives me an:

[b]Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 11
at BeatBox.buildGUI(BeatBox.java:60)
at BeatBox.main(BeatBox.java:22) [/b]
Here's the Code the put in [b]bold[/b] the Lines that the compiler said there were errors:

import java.awt.*;
import javax.swing.*;
import javax.sound.midi.*;
import java.util.*;
import java.awt.event.*;


public class BeatBox
{
JPanel mainPanel;
ArrayList checkboxList;
Sequencer sequencer;
Sequence sequence;
Track track;
JFrame theFrame;

String[] instrumentNames = {"Bass Drum", "Closed Hi-Hat", "Open Hi-Hat", "Acoustic Snare", "Crash Cymbal", "Hand Clap", "Cow Bell", "Vibraslap", "Low-mid Tom", "High Agogo", "Open Hi Conga"};
int[] instruments = {35, 42, 46, 38, 49, 39, 50, 60, 70, 72, 64, 56, 58, 47, 67, 63};

public static void main(String[] args)
{
[b]BeatBox2().buildGUI();[/b]
}



public void buildGUI()
{
theFrame = new JFrame("Cyber BeatBox");
theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BorderLayout layout = new BorderLayout();
JPanel background = new JPanel(layout);
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));

checkboxList = new ArrayList();
Box buttonBox = new Box(BoxLayout.Y_AXIS);

JButton start = new JButton("Start");
start.addActionListener(new MyStartListener());
buttonBox.add(start);

JButton stop = new JButton("Stop");
stop.addActionListener(new MyStopListener());
buttonBox.add(stop);

JButton upTempo = new JButton("Tempo Up");
upTempo.addActionListener(new MyUpTempoListener());
buttonBox.add(upTempo);

JButton downTempo = new JButton("Tempo Down");
downTempo.addActionListener(new MyDownTempoListener());
buttonBox.add(downTempo);

Box nameBox = new Box(BoxLayout.Y_AXIS);
for(int i = 0; i < 17; i++)
{
[b]nameBox.add(new Label(instrumentNames[i]));[/b]
}

background.add(BorderLayout.EAST, buttonBox);
background.add(BorderLayout.WEST, nameBox);

theFrame.getContentPane().add(background);

GridLayout grid = new GridLayout(16,16);
grid.setVgap(1);
grid.setHgap(2);
mainPanel = new JPanel(grid);
background.add(BorderLayout.CENTER, mainPanel);

for(int i = 0; i < 256;i++)
{
JCheckBox c = new JCheckBox();
c.setSelected(false);
checkboxList.add(c);
mainPanel.add(c);
}

setUpMidi();

theFrame.setBounds(50, 50, 300, 300);
theFrame.pack();
theFrame.setVisible(true);
}

public void setUpMidi()
{
try
{
sequencer = MidiSystem.getSequencer();
sequencer.open();
sequence = new Sequence(Sequence.PPQ, 4);
track = sequence.createTrack();
sequencer.setTempoInBPM(120);
}
catch(Exception e)
{
e.printStackTrace();
}
}

public void buildTrackAndStart()
{
int[] trackList = null;

sequence.deleteTrack(track);
track = sequence.createTrack();

for(int i = 0;i < 16; i++)
{
trackList = new int[16];
int key = instruments[i];

for(int j = 0; j < 16; j++)
{
JCheckBox jc = (JCheckBox) checkboxList.get(j + (16*i));
if (jc.isSelected())
{
trackList[j] = key;
}
else
{
trackList[j] = 0;
}
}
makeTracks(trackList);
track.add(makeEvent(176,1,127,0,16));
}

track.add(makeEvent(192,9,1,0,15));
try
{
sequencer.setSequence(sequence);
sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);
sequencer.start();
sequencer.setTempoInBPM(120);

}
catch(Exception e)
{
e.printStackTrace();

}

}

public class MyStartListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
buildTrackAndStart();
}
}

public class MyStopListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
sequencer.stop();
}
}

public class MyUpTempoListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
float tempoFactor = sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor * 1.03));
}
}

public class MyDownTempoListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
float tempoFactor = sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor * .97));
}
}


public void makeTracks(int[] list)
{
for (int i = 0; i < 16; i++)
{
int key = list[i];

if(key != 0)
{
track.add(makeEvent(144,9,key,100, i));
track.add(makeEvent(144,9,key,100,i+1));

}
}
}

public MidiEvent makeEvent(int comd, int chan, int one, int two, int tick)
{
MidiEvent event = null;

try
{
ShortMessage a = new ShortMessage();
a.setMessage(comd, chan, one, two);
event = new MidiEvent(a, tick);

}
catch (Exception e)
{
e.printStackTrace();
}
return event;
}
}

IM sorry for all the code just want to get it to work.

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