K.K. Calypso
From Nookipedia, the Animal Crossing wiki
"K.K. Calypso" (けけカリプソ) is an upbeat K.K. Slider song that is syncopated in African rhythm. Calypso music is iconic of the Caribbean island of Trinidad. Alli, Scoot, Twiggy, Patty, Fang, Harry (and Joey in Animal Crossing: New Leaf) play this song if they have a stereo in their house.