K.K. Chorale
From Nookipedia, the Animal Crossing wiki
K.K. Chorale is a K.K. Slider song. It is quite a soft and classical song. Cookie, Kitt, Alli, Apollo, and Chevre all play this song if they have a stereo in their homes. On the Animal Crossing-e card, it shows K.K. Slider being married to Daisy, with an audience watching.