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_1601027_2 (driver_matched_db VARCHAR, headphone_class VARCHAR)

### Question ###
Name the driver matched db for joseph grado signature

### Accurate SQL ###

SELECT driver_matched_db FROM table_1601027_2 WHERE headphone_class = "Joseph Grado Signature"