HTML Has a Tree Structure

        <TABLE>
            <TBODY>
                <TR>
                    <TD>Shady Grove</TD> 
                    <TD>Aeolian</TD> 
                </TR> 
                <TR>
                    <TD>Over the River, Charlie</TD>
                    <TD>Dorian</TD> 
                </TR>
            </TBODY> 
        </TABLE>