I have just started baking my own cakes and for my little girl's birthday I tried the downy yellow butter cake and the buttercream icing. The cake was very dense, so I 'm not sure if I did something wrong or that was how it was supposed to be. Also the icing tasted great and had a very silky texture, but at last minute I decided not to use it- I was worried it would not stay on the cake when I started decorating with different colors. Did I do something wrong or do you think I'm on the right track? Any advice from more experienced baker would be much appreciated.