How many weeks featured duffy as the original artist?
CREATE TABLE table_21501564_1 (theme VARCHAR, original_artist VARCHAR)
SELECT COUNT(theme) FROM table_21501564_1 WHERE original_artist = "Duffy"
### 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"