The first time I heard this little tune was in the original Animal Crossing. It appears as K.K. Song in every Animal Crossing title, and everyone's favorite musical doggie K.K. Slider (or Totakeke, his Japanese name) is named after Kazumi Totaka himself. As it turns out, this song doesn't only appear in Animal Crossing games, but in a slew of other titles as well. It can be heard in The Legend of Zelda: Link's Awakening, Mario Paint, Luigi's Mansion, Super Smash Brothers Brawl, Pikmin 2, Yoshi's Story, and in many other games too. It is still being determined whether or not this song is in more recent titles Totaka has worked on. Usually the song is pretty well hidden within certain areas of the game and will only play after a certain amount of time has passed.