All this piano cake takes to make is a double layer 8″ cake. I cut out the piano shape just by looking, then covering cake shape with thicker rolled fondant so I could shape it more if needed.
The keys are made up of thinly rolled fondant then where each key looks “divided” just take a toothpick and press from top to bottom. For small black keys, just dip toothpick in black liquid food color and press once for each key.
The sheet music was cut out of even thinner fondant and pretty much scribbled on with a toothpick and black liquid food coloring and attached with a tiny bit of frosting. Turned out great and no one even wanted to cut it!