Bake (2) 13 x 9 cakes, cool and freeze. Make a template of a microphone to follow and cut cake from. Layer the two cakes with frosting in between, then cut the microphone shape.
Frost with desired color for the microphone handle and black for the top. Add some black colored sugar and black detail piping for dimension and the switch on the handle.
Make stars and logo by melting chocolate in a Ziploc or pastry bag. Print out what you want, place under a sheet of wax paper and pipe the chocolate on top. When dry, carefully use a thin metal spatula to remove from the wax paper and place on your cake.