static void Main(string[] args)
        {
            // TODO: Declare and initialize a CD and a DVD object.
            CD  aCD  = new CD("The Beatles");
            DVD aDVD = new DVD("Halloween");

            // TODO: Call each CD and DVD method to verify that they work as expected.
            aCD.SpinDisc();
            aCD.StoreData();
            aCD.ReportDiscInfo();

            aDVD.SpinDisc();
            aDVD.StoreData();
            aDVD.ReportDiscInfo();
        }