Zelda: Link's Awakening Easter Egg - Prince Richard & Totaka's Song

While looking for the Slime Key you will meet up with a prince called Richard. He was kicked out of Kanalet Castle by monsters, and he asks you to retrieve five Gold Leaves from the castle before he'll let you get the Slime Key. Richard (and the frogs in his villa) originally appeared in the Japan only Game Boy game Kaeru no Tameni Kaneha Naru. Richard was your character's rival in the game, and prince of the Custard Kingdom. The music in Richard's Villa is a remixed version of the Kaeru no Tameni Kaneha Naru overworld music.

Stand inside and let the music run for a while. After a couple of minutes it will change to Kazumi Totaka's Song.