Spring Blossoms
From Nookipedia, the Animal Crossing wiki
Spring Blossoms is a K.K. Slider song. It first appeared in Animal Crossing: Wild World if the player requests an invalid song name. The song reappears as a secret song in Animal Crossing: City Folk. When the player requests the song's name, K.K. Slider will talk about a character named "June"; June is an islander in Animal Crossing. The music is originally from the Cherry Blossom Festival theme from Doubutsu no Mori and Doubutsu no Mori+. It is owned by Cole, Zucker, and Rolf (in Animal Crossing: New Leaf).