Take mixing bowl and add maida,baking soda,baking powder,cocoa powder and mix it.now sieve 3-4 tine.

Now add oil,sugar,milk and essence and mix well.

Now grease cake tray and pour cake mixture to it.

Now bake it in pre heated cooker for 25-30 minutes at low flame.

Now draw piano on cardboard and cut out piano.now melt chocolate and spread it on plastic sheet and keep for sometime to cool it.

Now put cut out piano on it and cut chocolate oin piano shape.

Now take out cake and put piano cardboard on it and cut out.

Now spread chocolate on piano cake and decorate with whipped Cream and pi,chilled it and serve.