docs: def azlyrics(song):
      """
      Returns the lyrics found in azlyrics for the specified mp3 file or an empty
      string if not found.
      """
      artist = song.artist.lower()
      if artist[0:2] == 'a ':
          artist = artist[2:]
      artist = normalize(artist, URLESCAPES, '')
      title = song.title.lower()
      title = normalize(title, URLESCAPES, '')
  
      url = 'https://www.azlyrics.com/lyrics/{}/{}.html'.format(artist, title)
      soup = get_url(url)
      body = soup.find_all('div', class_='')[-1]
      return body.get_text().strip()