Show all cities where at least one customer lives in but no performer lives in.
SELECT T1.City_Town FROM Addresses AS T1 JOIN Customers AS T2 ON T1.Address_ID  =  T2.Address_ID EXCEPT SELECT T1.City_Town FROM Addresses AS T1 JOIN Performers AS T2 ON T1.Address_ID  =  T2.Address_ID
SELECT T1.City_Town FROM Addresses AS T1 JOIN Customers AS T2 ON T1.Address_ID  =  T2.Address_ID EXCEPT SELECT T1.City_Town FROM Addresses AS T1 JOIN Performers AS T2 ON T1.Address_ID  =  T2.Address_ID
[{'City_Town': 'Jasthaven'}, {'City_Town': 'Lindberg'}, {'City_Town': 'Monahanshire'}, {'City_Town': 'Nataliamouth'}, {'City_Town': 'New Lonzoville'}, {'City_Town': 'Port Maximeview'}, {'City_Town': 'Purdyville'}]