docs: def metrolyrics(song):
      """
      Returns the lyrics found in metrolyrics for the specified mp3 file or an
      empty string if not found.
      """
      translate = {URLESCAPE: '', ' ': '-'}
      title = song.title.lower()
      title = normalize(title, translate)
      title = re.sub(r'\-{2,}', '-', title)
      artist = song.artist.lower()
      artist = normalize(artist, translate)
      artist = re.sub(r'\-{2,}', '-', artist)
  
      url = 'http://www.metrolyrics.com/{}-lyrics-{}.html'.format(title, artist)
      soup = get_url(url)
      body = soup.find(id='lyrics-body-text')
      if body is None:
          return ''
  
      text = ''
      verses = body.find_all('p')
      for verse in verses:
          text += verse.get_text().strip()
          text += '\n\n'
  
      return text.strip()