K.K. Soul
From Nookipedia, the Animal Crossing wiki
"K.K. Soul" (けけソウル) is a K.K. Slider song. It is very contempt with intricate drum beats, melodies, and is not as soulful as may be thought. It is more of a stepping-out, urban, or gleaming theme that is happy. It is also a very homey song and may sometimes get confused with Soulful K.K.. Chadder, Henry, Mint, Daisy, Bangle, Bea and Sandy will play this song in their homes.
File:Animal Crossing K.K. Soul.mp3