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

who sings the last song on this album ?
SELECT "performer(s)" FROM table_204_573 ORDER BY "#" DESC LIMIT 1
SELECT "performer(s)" FROM "table_204_573" ORDER BY "#" DESC NULLS LAST LIMIT 1