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_name_84 (songwriter_s_ VARCHAR, production_credits VARCHAR, track VARCHAR)

### Question ###
Who was the songwriter for Track 4, produced by nigel wright and john smits?

### Accurate SQL ###

SELECT songwriter_s_ FROM table_name_84 WHERE production_credits = "nigel wright and john smits" AND track = 4