Which genre does the movie Dancer in the Dark belong to?
genre refers to genre_name; movie Dancer in the Dark refers to title = 'Dancer in the Dark'
SELECT T3.genre_name FROM movie AS T1 INNER JOIN movie_genres AS T2 ON T1.movie_id = T2.movie_id INNER JOIN genre AS T3 ON T2.genre_id = T3.genre_id WHERE T1.title = 'Dancer in the Dark'