K.K. March
From Nookipedia, the Animal Crossing wiki
"K.K. March" is a marching band song by K.K. Slider. It incorporates all types of marching band instruments - drums, cymbal, horns, etc. It sounds almost retro-themed, like from the original NES.
Iggly, Del, Rod, Hector, Huggy, Paolo, Rollo, Sandy, and Weber have this song in their houses.