CREATE TABLE table_58340 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Who was the away team at mcg?
SELECT "Away team" FROM table_58340 WHERE "Venue" = 'mcg'
SELECT "Away team" FROM "table_58340" WHERE "Venue" = 'mcg'