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 song ( artist_name VARCHAR, f_id VARCHAR )
TABLE: CREATE TABLE files ( f_id VARCHAR, duration VARCHAR )

### Question ###
What is the name of the artist who produced the shortest song?

### Accurate SQL ###

SELECT T1.artist_name FROM song AS T1 JOIN files AS T2 ON T1.f_id = T2.f_id ORDER BY T2.duration LIMIT 1