The Council shall fix by ordinance the salary rate of compensation of all officers and employees of the City entitled to compensation except as otherwise provided in this Charter; but this shall not prevent the City from securing the services of special or temporary employees who shall receive such compensation as may be agreed upon, and approved by Council. Council may require any officer or employee to give a bond for the faithful performance of his duty, in such an amount as it may determine, and it may provide that the premium thereof shall be paid by the City.