Converts notation in closing_notation into a lilypond string.
        :return: str

def GetClosingNotationLilies(self):
        '''
        Converts notation in closing_notation into a lilypond string.
        :return: str
        '''
        lstring = ""
        for notation in self.closing_notation:
            result = notation.toLily()
            if type(result) == list:
                result = "".join(result)
            lstring += result
        return lstring