Mechanical Harp (Windmills)

The Mechanical Harp (Windmills) is a treasure in. It is a music box that, when carried or interacted with in the Treasure Catalog, plays the Song of Storms from the The Legend of Zelda series. Underneath its bottom is an engraving that reads "H13.001026", which stands for Heisei 13 October 26, the release date for using the Japanese era calendar scheme, which corresponds to October 26 2001 in the Gregorian calendar.

Collecting the treasure
The Mechanical Harp is on a stool in the northwestern corner of the Hero's Hideaway. To collect it, you must reverse the airstreams via the button on the kitchen table nearby, then take the fan on the table which will blow you over to the stool. Then, throw 7 Pikmin at it.