Method which converts the object instance, its attributes and children to a string of lilypond code

        :return: str of lilypond code

def toLily(self):
        '''
        Method which converts the object instance, its attributes and children to a string of lilypond code

        :return: str of lilypond code
        '''
        lilystring = ""
        if self.duration > 0:
            lilystring += "r" + str(self.duration)
        return lilystring