Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15778392_1 (theme VARCHAR, week__number VARCHAR)

### Question ###
WHERE THE WEEK NUMBER WAS TOP 8, WHAT WAS THE THEME?

### Accurate SQL ###

SELECT theme FROM table_15778392_1 WHERE week__number = "Top 8"