K.K. Lullaby

"K.K. Lullaby" is a calm, slow song that is featured in every games to date. When played on a stereo, the tune is played like a music box, with little metallic noises designed to relax the player. At the end of the song, the last few notes play in reverse, reminiscent of a music box being rewound. The technique is identical to one seen in the 1980 song "Isolation" by British post-punk group Joy Division. Gabi is seen on the album cover, watching Daisy rock baby K.K. to sleep. Snake, Nate, Felicity, Stitches, Midge, Stu, Maple (both only in ) Claude, Poppy, Carrie, Étoile and Judy all play this song in their house if they have a stereo.

On the Animal Crossing e-card, it has a similar picture to the album cover that would later be used in. However, Pompom is rocking K.K. Slider instead of Daisy, in reference to the nursery rhyme Mother Goose.