docs: def generate_urls_for_genre(self, genre_url):
      """
      Generate URL's for genre
      """
      letters = list(string.ascii_uppercase)
      urls = []
      for letter in letters:
        base = '{}&letter={}'.format(genre_url, letter)
        page = r.get(base)
        tree = html.fromstring(page.content)
        elements = tree.xpath("//ul[@class='list paginate']")
        if not elements:
          urls.append(base)
        else:
          for i in xrange(1, self._find_num_pages(base)):
            urls.append('{}&page={}#page'.format(base, i))
      return urls