That was very quick, thank you very much :) Then, could you please let me know the average duration (milliseconds) of Latin and Pop?
SELECT AVG ( Milliseconds )  FROM GENRE AS T1 JOIN TRACK AS T2 ON T1.GenreId   =   T2.GenreId WHERE T1.Name = "Latin" OR T1.Name = "Pop"
average duration = AVG(Milliseconds); genres Latin and Pop refers to WHERE T1.Name = 'Latin' OR T1.Name = 'Pop'; joining tables GENRE and TRACK refers to JOIN TRACK AS T2 ON T1.GenreId = T2.GenreId;