Who is the original performer when the episode is casting?
CREATE TABLE table_31213 (
    "Episode" text,
    "Theme / Date" text,
    "Song title" text,
    "Original performer" text,
    "Result (Placement)" text
)
SELECT "Original performer" FROM table_31213 WHERE "Episode" = 'Casting'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who is the original performer when the episode is casting? ### Input: CREATE TABLE table_31213 (
    "Episode" text,
    "Theme / Date" text,
    "Song title" text,
    "Original performer" text,
    "Result (Placement)" text
) ### Response: SELECT "Original performer" FROM table_31213 WHERE "Episode" = 'Casting'