From Nookipedia, the Animal Crossing wiki
K.K. House is a K.K. Slider song that was introduced in Animal Crossing: City Folk. It has a fast, upbeat tune with many minor scale notes, although it is a major scale song. It is one of K.K. Slider's longer songs. Penelope, Gayle, and Friga are featured on the cover, along with K.K. in the background. Bianca, Agnes, Canberra, Jacques and Boris (in Animal Crossing: New Leaf - Welcome amiibo) play this song if they have a stereo in their houses.