user: Question: Who is the original artist with a theme of N/A?
Columns: ['Week #', 'Theme', 'Song choice', 'Original artist', 'Order #', 'Result']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Audition', 'N/A', '" All I Do "', 'Stevie Wonder', 'N/A', 'Advanced']
SQL:

assistant: SELECT "Original artist" FROM "Table" WHERE "Theme" = 'N/A';