Animal Crossing New Horizons Island Tunes are this game's version of the town tune. To change it, you'll first need to unlock the full Resident Services building. Among all of the new customization mechanics in the latest Animal Crossing, the series mainstay of tunes still remains.
Animal Crossing New Horizons Island Tunes
To change the Island Tune, you just have to talk to Isabelle and ask her to change the island tune. From here, you can compose your own melody that will play whenever you talk to someone or go inside a building.
A cute twist in New Horizons is that Isabelle will sing the tune for you as a preview. If you are musically inclined, island tunes (like town tunes before) are in the key of C Major, so you can transpose your favorite songs for Animal Crossing.
As tunes have been a series staple since the original Animal Crossing, you can go to the massive online back catalog of town tunes of previous games to find a song or melody that suits your fancy if you wish. You can't go wrong with Zelda!