input: 
  from typing import List
  
  
  def Song_Class_Matches_Criteria(song_instances: List) -> bool:
      """
      Check if the provided Song class instances match the given criteria.
      >>> song1 = Song("Bohemian Rhapsody", "Queen")
      >>> song2 = Song("Stairway to Heaven", "Led Zeppelin")
      >>> song3 = Song("Bohemian Rhapsody", "Queen")
      >>> Song_Class_Matches_Criteria([song1, song2, song3])
      True
      """
      for song in song_instances:
          for other_song in song_instances:
              if (song == other_song) != (song.title == other_song.title and song.artist == other_song.artist):
                  return False
              if str(song) != f'Title: {song.title}\nArtist: {song.artist}':
                  return False
              if song.length() != len(song.title):
                  return False
      return True
  
output:     for song in song_instances:
          if not isinstance(song, Song):
              return False
      return True