All white cake with white chocolate ganache filling. Iced with buttercream. I used the Wilton guitar pan for the top. The bottom is 12x18, two layers. This is for my hubby's uncle's surprise 60th bday party. He is very musical and plays bluegrass. I don't usually do a lot of sheetcakes, but this needed to feed over 70 people and its a freebie, so I went this route,