CREATE TABLE table_78366 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Save" TEXT, "Attendance" TEXT, "Record" TEXT)

What was the score of the Mariners game when they had a record of 56 21?
SELECT "Score" FROM table_78366 WHERE "Record" = '56–21'
SELECT "Score" FROM "table_78366" WHERE "Record" = '56–21'