old_contents: class Sheet(object):
  	""" sheet: Top level object.
  		Models the entire music sheet """
  	def __init__(self, name):
  		super(sheet, self).__init__()
  		self.name = name
  		self.bars = list()
  
  class Bar(object):
  	""" bar: Models a measure.
  		Compose the sheet as the temporal layer
  			=> Where the notes are displayed on the sheet """
  	def __init__(self, time_signature=4):
  		super(bar, self).__init__()
  		self.time_signature = time_signature
  		self.notes = list()
  
  class Note(object):
  	""" note: Models the unit in music representation
  		Drives visual representation
  			=> What note must be displayed on the sheet """
  	def __init__(self, pitch, duration=1):
  		super(bote, self).__init__()
  		self.pitch = pitch
  		self.duration = duration
  
new_contents: # coding: utf-8
  
  class Sheet(object):
  	""" sheet: Top level object.
  		Models the entire music sheet """
  	def __init__(self, name):
  		super(sheet, self).__init__()
  		self.name = name
  		self.bars = list()
  
  class Bar(object):
  	""" bar: Models a measure.
  		Compose the sheet as the temporal layer
  			=> Where the notes are displayed on the sheet """
  	def __init__(self, time_signature=4):
  		super(bar, self).__init__()
  		self.time_signature = time_signature
  		self.notes = list()
  
  class Note(object):
  	""" note: Models the unit in music representation
  		Drives visual representation
  			=> What note must be displayed on the sheet """
  	def __init__(self, pitch, duration=1):
  		super(bote, self).__init__()
  		self.pitch = pitch
  		self.duration = duration
  
subject: CLEAN enconding