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, and Zell play this song in their houses.