code: public int getLineNumber() {
  		if ((m_lineNumber == -1) && (getName() != null)) {
  			if (isG())
  				m_lineNumber = 2;
  			else if (isF())
  				m_lineNumber = 4;
  			else if (isC())
  				m_lineNumber = 3;
  			else if (isPerc())
  				m_lineNumber = 3;
  		}
  		return m_lineNumber;
  	}
docs: Returns the number of the line staff where clef is printed.
  2 for treble, 3 for alto, 4 for tenor, 4 for bass...