SELECT COUNT(*) FROM GENRE AS T1 JOIN TRACK AS T2 ON T1.GenreId  =  T2.GenreId WHERE T1.Name  =  "Rock"
How many tracks belong to rock genre?
SELECT COUNT ( * ) FROM GENRE AS T1 JOIN TRACK AS T2 ON T1.GenreId = T2.GenreId WHERE T1.Name = `` Rock ''
select count ( * ) from genre as t1 join track as t2 on t1 . genreid = t2 . genreid where t1 . name = value
How many tracks belong to rock genre ?