code: def format(self, pattern):
          
          pattern = pattern.replace('%a', self.artist.name)
          pattern = pattern.replace('%s', self.name)
          pattern = pattern.replace('%A', self.album.name)
          return pattern.replace('/', '') \
                        .replace('\\', '') \
                        .replace(":", "") \
                        .replace("*", "") \
                        .replace("?", "") \
                        .replace('"', "") \
                        .replace("|", "") \
                        .replace("<", "") \
                        .replace(">", "")
docs: Format the song according to certain patterns:
  
          %a: artist title
          %s: song title
          %A: album title