CREATE TABLE table_204_573 (id DECIMAL, "#" DECIMAL, "title" TEXT, "performer ( s ) " TEXT, "film" TEXT, "length" TEXT)

which song has the most time ?
SELECT "title" FROM table_204_573 ORDER BY "length" DESC LIMIT 1
SELECT "title" FROM "table_204_573" ORDER BY "length" DESC NULLS LAST LIMIT 1