K.K. Reggae
From Nookipedia, the Animal Crossing wiki
K.K. Reggae is a laid-back K.K. song. It is named after the Jamaican style of music, Reggae, and has a simple R and B drum kit, a dub synth that is the main melody, and a lightly riffed organ. Curly, Piper, Bill, Hamlet, and Shep play this song if they have a stereo in their houses.