Task: Text to Code
Input (English): Step 1: For each row in files table, find the corresponding rows in song table.
Step 2: find the number of rows of each value of song's f_id in the results of step 1.
Step 3: find files's artist_name of step 1 results with largest value in the results of step 2
Output (English): SELECT T1.artist_name FROM files AS T1 JOIN song AS T2 ON T1.f_id = T2.f_id GROUP BY T2.f_id ORDER BY Count ( * ) Desc LIMIT 1