from Pokemon Mystery Dungeon Explorers of Time/Darkness/Sky
Relevant excerpt from the game credits:
Sound Director:
Misaki Okibe
Composition & SE:
Arata Iiyoshi
Hideki Sakamoto
Keisuke Ito
Ryoma Nakamura
Ken-ichi Saito
Imported and adapted from https://bitmidi.com/uploads/85707.mid
Yay! It looks like this melody can be played offline on a 30 note paper strip music box!
All you need to do is:
Sounds very pretty :)