CREATE TABLE table_204_56 (id DECIMAL, "year" DECIMAL, "song" TEXT, "us r&b" DECIMAL, "us rap" DECIMAL, "album" TEXT)

what year had the most singles ?
SELECT "year" FROM table_204_56 GROUP BY "year" ORDER BY COUNT("song") DESC LIMIT 1
SELECT "year" FROM "table_204_56" GROUP BY "year" ORDER BY COUNT("song") DESC NULLS LAST LIMIT 1