From the book LEO the Maker Prince:
leothemakerprince.com
amazon.com/LEO-Maker-Prince-Journeys-Printing/dp/1457183145
Alexa looked for toys to download for her and her brothers to play with. She decided to make different musical instruments so they could form a band together. There is a rubber band guitar, a percussive shaker, a "woodpecker" knocker and an ocarina.