How many tracks does each genre have and what are the names of the top 5?
SELECT T1.name ,  COUNT(*) FROM genres AS T1 JOIN tracks AS T2 ON T2.genre_id  =  T1.id GROUP BY T1.id ORDER BY count(*) DESC LIMIT 5;
Her türün kaç parçasına sahip ve ilk 5'in isimleri nelerdir?