old_contents: 
  
  # The note off event contains no data, except for the least significant bits
  # represening the polyphonic ID, so that all notes with that particular
  # polyphonic ID can be turned off.
  def parse_noteOff(bmsfile, read, strict, commandID):
      return commandID & 0b111
  
  # Several commands use three bytes of data and one byte for
  # something else. Because Python's struct module does not have
  # a way to parse three bytes at once, we need to do it as follows.
  def parse_1Byte_1Tripplet(bmsfile, read, strict, commandID):
      byte = read.byte()
      tripplet = read.tripplet()
  
      return (byte, tripplet)
  
  # Variable-length delay
  def parse_VL_delay(bmsfile, read, strict, commandID):
      start = bmsfile.tell()
  
      value = read.byte()
  
      while (value >> 7) == 1:
          value = read.byte()
  
      dataLen = bmsfile.tell() - start
      bmsfile.seek(start)
  
      data = read.byteArray(dataLen)
  
      return (data, )
  
new_contents: 
  
  # The note off event contains no data, except for the least significant bits
  # represening the polyphonic ID, so that all notes with that particular
  # polyphonic ID can be turned off.
  def parse_noteOff(bmsfile, read, strict, commandID):
      return (commandID & 0b111,)
  
  # Several commands use three bytes of data and one byte for
  # something else. Because Python's struct module does not have
  # a way to parse three bytes at once, we need to do it as follows.
  def parse_1Byte_1Tripplet(bmsfile, read, strict, commandID):
      byte = read.byte()
      tripplet = read.tripplet()
  
      return (byte, tripplet)
  
  # Variable-length delay
  def parse_VL_delay(bmsfile, read, strict, commandID):
      start = bmsfile.tell()
  
      value = read.byte()
  
      while (value >> 7) == 1:
          value = read.byte()
  
      dataLen = bmsfile.tell() - start
      bmsfile.seek(start)
  
      data = read.byteArray(dataLen)
  
      return (data, )
  
subject: Make return value of function a tuple