Piano Birthday Cake..

I love this! I'm making a cake for my mom's retirement party. She taught music for 35 years. Any tips on making the keyboard and staff so exact?

Thanks...The keyboard just worked out for me...I used 9x13 pan for the cake. I cut the keys about a thumb width each. The staff (lines) are made from sugar sheets that I cut into stripes(holds shape better) The music notes are made from fondant and sugar sheets.