CREATE TABLE vocals (songid VARCHAR)
CREATE TABLE songs (songid VARCHAR)

Which song has the most vocals?
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
SELECT "title" FROM "vocals" AS "T1" JOIN "songs" AS "T2" ON "T1"."songid" = "T2"."songid" GROUP BY "T1"."songid" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1