text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_21501564_1 (theme VARCHAR, original_artist VARCHAR)
  ### Question:
  How many weeks featured duffy as the original artist?
  ### Answer:
  SELECT COUNT(theme) FROM table_21501564_1 WHERE original_artist = "Duffy"