K.K. Bazaar
From Nookipedia, the Animal Crossing wiki
"K.K. Bazaar" (けけロマ, K.K. Roma) is a song by K.K. Slider in Animal Crossing: New Leaf. It has a very fast tempo and is inspired by music from the Middle East. The song features heavy usage of the accordion, a musical instrument typically used in Romani music. On the album cover, Olivia is seen wearing a purple dress, and Cesar, Ozzie, and K.K. Slider are behind her.
Diva is the only villager who owns this song. Saharah also has this playing in her RV.