Donkey Konga 2 (Japanese version)
July 1, 2004
The Japanese version of the game features "Oshirete", the opening theme from the Heidi, Girl of the Alps anime, as one of the playable tracks. It's listed in the "Anime" section and its difficulty level is 1, making it the easiest song in the game.
See here for other songs featured in the game.
The creators of Donkey Konga 2 were licensed to use the song by its owners.