user: Question: Who was the songwriter for Track 4, produced by Nigel Wright and John Smits?
Columns: ['Track', 'Title', 'Songwriter(s)', 'Production credits', 'Time']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Welcome To My Party"', 'R.Sommer, M. Schimscheimer, J. van Katwijk', 'Nigel Wright and John Smits', '3:00']
SQL:

assistant: SELECT "Songwriter(s)" FROM "Table" WHERE "Production credits" = 'Nigel Wright and John Smits' AND "Track" = 4.0;