Show me how many vocals each song uses.
select count(*) from vocals as t1 join songs as t2 on t1.songid = t2.songid group by t1.songid
Which one has the most? Show me the song title.
select title from vocals as t1 join songs as t2 on t1.songid = t2.songid group by t1.songid order by count(*) desc limit 1