CREATE TABLE table_31213 ("Episode" CLOB, "Theme / Date" CLOB, "Song title" CLOB, "Original performer" CLOB, "Result  ( Placement ) " CLOB)

Who is the original performer when the episode is casting?
SELECT "Original performer" FROM table_31213 WHERE "Episode" = 'Casting'
SELECT "Original performer" FROM "table_31213" WHERE "Episode" = 'Casting'