Frost It Cakery black and gold cake
Not quite piano or music themed, but this black and white striped cake might be a subtle option for a piano lover. Blush and Black via RooneyGirl BakeShop
35 Gorgeous Wedding Cakes from Talented The Cake Whisperer - MODwedding painted gold ruffles movement
Red, White and Black Wedding Cake. Gothic Theme but this is amazing and can be a great cake for any occassion.
Wedding Cakes: White and black wedding cake with bright red flowers