The size of the actual panel was designed to fit onto a piano's keyboard with the lid closed. The Music Shield used has a built in audio amplifier which eliminates the need for external amplifier. A Maestro can play continuously on the same instrument, uninterrupted. but still allows for the diversity of the music shield to be experienced. Otherwise when idle the provided Arduino sketch plays assigned MIDI notes for each Pumpkin, along with changing instruments, ensuring it has an audience. While only 15 keys are initially implemented the same design and code can accommodate a total of 48 keys if desired. Almost a whole piano. Which would be a lot of pumpkins.