code: public Music getMusicForGraphicalRendition() {
  		if ((m_multiPartsDef == null) && (m_parts == null))
  			return (m_defaultPart.getMusic());
  		else {
  			//Vector alreadyAddedParts = new Vector();
  			Music globalScore = newMusic();
  			globalScore.append(m_defaultPart.getMusic());
              for (Object m_part : m_parts) {
                  Part part = (Part) m_part;
                  globalScore.append(part.getMusic());
              }
  			return globalScore;
  		}
  	}
docs: Return the music for graphical rendition, i.e. if structure is ABBA, and
  score contains 2 parts P:A and P:B, returns a music composed of the 2
  parts. {@link #getMusic()} returns a music composed of 4 parts which is
  ok for audio/midi rendition, but not good for graphical score rendition.