What countries are the female artists who sung in the language Bangla from?
SELECT T1.country FROM artist AS T1 JOIN song AS T2 ON T1.artist_name  =  T2.artist_name WHERE T1.gender  =  "Female" AND T2.languages  =  "bangla"
female artists refers to gender = 'Female'; sung in Bangla refers to languages = 'bangla'; countries of the artists refers to country;