K.K. Song is a song by K.K. Slider. The song is better known as Totaka's Song: an easter egg song hidden within many games that the composer Kazumi Totaka has worked on. The main part of the song is the famous 19-note piece created by Totaka-san, with various sound effects added to the end of the song.
These villagers play K.K. Song inside of their homes once they own a stereo.