K.K. D & B
From Nookipedia, the Animal Crossing wiki
"K.K. D & B" is short for drum and bass. The bass in the song is played on a synthesizer and the drums sound electronic. There is a lower octave synth bass and a higher octave synth bass. The two bass can be heard in the opening and part-way through the middle. The electronic drums are heard after that.
In New Leaf, the song is titled "K.K. D&B" instead of "K.K. D & B".
This song also plays on the player's TV at a certain hour of the day while the "Breaking News" channel is on, although the whole song is not played. Hans, Murphy, Octavian, Zell and Gonzo play this song in their houses.