What week # featured first solo as the theme?
CREATE TABLE table_21501564_1 (
    week__number VARCHAR,
    theme VARCHAR
)
SELECT week__number FROM table_21501564_1 WHERE theme = "First Solo"
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: What week # featured first solo as the theme? ### Input: CREATE TABLE table_21501564_1 (
    week__number VARCHAR,
    theme VARCHAR
) ### Response: SELECT week__number FROM table_21501564_1 WHERE theme = "First Solo"