SELECT count(DISTINCT title) FROM vocals AS T1 JOIN songs AS T2 ON T1.songid  =  T2.songid WHERE TYPE  =  "lead"
How many songs have vocals of type lead?
SELECT count ( DISTINCT title ) FROM vocals AS T1 JOIN songs AS T2 ON T1.songid = T2.songid WHERE TYPE = `` lead ''
select count ( distinct title ) from vocals as t1 join songs as t2 on t1 . songid = t2 . songid where type = value
How many songs have vocals of type lead ?