code: public boolean putTune(Tune tune) {
  		boolean ret = containsTune(tune);
  		tune.getTuneInfos().setBookInfos(getBookInfos());
  		tune.getInstructions().addAll(0, getInstructions());
  		m_tunes.put(tune.getReferenceNumber(), tune);
  		return ret;
  	}
docs: Put a tune into the book. If exists, replace tune with the same reference
  number and returns true. If doesn't exist, add it and return false.
  
  @return true if it replaced an existing tune, false otherwise