K.K. Rock
From Nookipedia, the Animal Crossing wiki
"K.K. Rock" (けけロック) is like a hard-rock-type of song with a repeating tune. It has an edgy guitar that makes it sound like heavy metal. It has a crunchy metallic theme with gritty, off-key chords. Apollo (in Animal Crossing: New Leaf), Camofrog, Fuchsia, Tiffany, Woolio, Ike, Groucho and Wolfgang (both in Animal Crossing) have this song playing in their houses.