Give the distinct famous release dates for all artists.
SELECT distinct(Famous_Release_date) FROM artist
SELECT distinct(Famous_Release_date) FROM artist
[{'Famous_Release_date': 'November 2007'}, {'Famous_Release_date': 'January 21, 2008'}, {'Famous_Release_date': '2009'}, {'Famous_Release_date': 'June 23, 2008'}, {'Famous_Release_date': 'June 15, 2009'}]