CREATE TABLE table_204_420 (id DECIMAL, "month" TEXT, "song" TEXT, "artist" TEXT, "aggregate points" DECIMAL, "total downloads" DECIMAL, "year-end chart" DECIMAL)

other artist to end in the top two on the year end chart besides psy
SELECT "artist" FROM table_204_420 WHERE "artist" <> 'psy' AND "year-end chart" <= 2
SELECT "artist" FROM "table_204_420" WHERE "artist" <> 'psy' AND "year-end chart" <= 2