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_21501511_1 (song_choice VARCHAR, week__number VARCHAR)

### Question ###
What was Lambert's song choice in the top 13?

### Accurate SQL ###

SELECT song_choice FROM table_21501511_1 WHERE week__number = "Top 13"