K.K. Aria
From Nookipedia, the Animal Crossing wiki
"K.K. Aria" is a quiet song by K.K. Slider. An aria is an expressive song performed by one singer and accompanied by an orchestra. K.K. can be seen dancing with Lucy, with Midge and Monique sitting in the background. Anicotti, Bunnie, Becky, Billy, Boots, Celia, Huggy, June, Knox and Marcie all listen to this song in their homes.