K.K. Ragtime
From Nookipedia, the Animal Crossing wiki
K.K. Ragtime is an 1890s-styled song by K.K. Slider. It has a ragtime piano syncopated in a melodic line and regularly accented. It sounds like a song played in a western saloon or a line/square dancing song. This song can also can be heard on the TV at a certain hour of the day on a comedy show where there is a young man and woman doing comedy for the audience on stage. Moe, Bones, Broccolo, Melba and Anchovy (as well as Bob and Mathilda in Animal Crossing: New Leaf) have it in their houses.