"Heart Is Filled With Sunshine" is a song played in "St. Olga's Reform School for Wayward Princesses", sung by the St. Olga's singing teacher.
When your heart is filled with sunshine
And you're feeling oh, so free
All of life is just divine
And the world is full of glee!
- On the BMI Music Repertoire website, this song is listed as work #20999377.