docs: def songlyrics(song):
      """
      Returns the lyrics found in songlyrics.com for the specified mp3 file or an
      empty string if not found.
      """
      translate = {
          URLESCAPE: '',
          ' ': '-'
      }
      artist = song.artist.lower()
      artist = normalize(artist, translate)
      title = song.title.lower()
      title = normalize(title, translate)
  
      artist = re.sub(r'\-{2,}', '-', artist)
      title = re.sub(r'\-{2,}', '-', title)
  
      url = 'http://www.songlyrics.com/{}/{}-lyrics'.format(artist, title)
      soup = get_url(url)
      text = soup.find(id='songLyricsDiv')
      if not text:
          return ''
  
      text = text.getText().strip()
      if not text or text.lower().startswith('we do not have the lyrics for'):
          return ''
  
      return text