Use black candy coating to fill music note cavities. Use black and white candy coating to pipe details in guitar. Allow to set and fill remainder of cavity with blue candy coating. Fill letters with red candy coating. Place all molds in freezer and allow candy coating to completely set before removing pieces.
Cover 7" cake in red fondant and 10" cake in black fondant. Stack 7" cake slightly offset to the side, using your preferred stacking method. Attach candy pieces to cake using small dots of melted candy coating.