Mechanical Harp (Memory Song)

The Mechanical Harp (Memory Song) is a treasure in. It is a music box that, when carried or interacted with in the Treasure Catalog, plays the main theme of Pikmin 3. Underneath its bottom is an engraving that reads "H13.001026", which stands for Heisei 13 October 26, the release date for Pikmin using the that corresponds to 26 in the Gregorian calendar.

Collecting the treasure
It is on a ledge at the northeastern section of the Blossoming Arcadia. It is too high to be reached by most Pikmin and cannot be knocked down with a rush from Oatchi, meaning Yellow Pikmin are mandatory to collect it. To collect this treasure, you must throw 7 Yellow Pikmin at it.

Trivia

 * Louie believes that the main theme of Pikmin 3 would be perfect to listen to while drinking juice. This is presumably a reference to that game's gameplay loop, in which the protagonists must survive by drinking juice from the fruits they gather over the course of the game.