From the [Japanese website](https://www.nintendo.com/jp/switch/aqmxa/index.html):
[Overworld music](https://www.nintendo.com/jp/switch/aqmxa/assets/sound/top/bgm_01.mp3)
[Wonder Flower music](https://www.nintendo.com/jp/switch/aqmxa/assets/sound/top/bgm_02.mp3)