What are their preferred genres?
SELECT T1.preferred_genre FROM artist AS T1 JOIN song AS T2 ON T1.artist_name  =  T2.artist_name WHERE T2.languages  =  "bangla" GROUP BY T2.artist_name ORDER BY count ( * )  DESC LIMIT 3
preferred genres = T1.preferred_genre; based on artists who sing songs in a specific language (bangla) = WHERE T2.languages = \"bangla\"; ranking by the number of songs in that language = ORDER BY COUNT(*) DESC; limit to top 3 = LIMIT 3;