def songs_connection():
  '''this method connects to the songs collection and returns collection
  object.'''
  connection = dbo()
  connection.this_db( 'local' )
  connection.this_collection( 'songs' )
  return connection
def playlists_connection():
  '''this method connects to the playlists collection and returns collection
  object.'''
  connection = dbo()
  connection.this_db( 'local' )
  connection.this_collection( 'playlists' )
  return connection