docs: def darklyrics(song):
      """
      Returns the lyrics found in darklyrics for the specified mp3 file or an
      empty string if not found.
      """
  
      # Darklyrics relies on the album name
      if not hasattr(song, 'album') or not song.album:
          song.fetch_album_name()
          if not hasattr(song, 'album') or not song.album:
              # If we don't have the name of the album, there's nothing we can do
              # on darklyrics
              return ''
  
      artist = song.artist.lower()
      artist = normalize(artist, URLESCAPES, '')
      album = song.album.lower()
      album = normalize(album, URLESCAPES, '')
      title = song.title
  
      url = 'http://www.darklyrics.com/lyrics/{}/{}.html'.format(artist, album)
      soup = get_url(url)
      text = ''
      for header in soup.find_all('h3'):
          song = str(header.get_text())
          next_sibling = header.next_sibling
          if song.lower().find(title.lower()) != -1:
              while next_sibling is not None and\
                      (next_sibling.name is None or next_sibling.name != 'h3'):
                  if next_sibling.name is None:
                      text += str(next_sibling)
                  next_sibling = next_sibling.next_sibling
  
      return text.strip()