CREATE TABLE table_16658 ("Round" FLOAT, "Grand Prix" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Constructor" TEXT, "Report" TEXT)

Who was on the pole position at the monaco grand prix?
SELECT "Pole Position" FROM table_16658 WHERE "Grand Prix" = 'Monaco Grand Prix'
SELECT "Pole Position" FROM "table_16658" WHERE "Grand Prix" = 'Monaco Grand Prix'