For most our hearts are in the right place. This poses a qwestion different than a physical position.
The music was written by Georges Auric. The original French lyrics were by Jacques Larue, the English words by William Engvick. However, in the film the song is called "It's April Again", and there is no mention of the phrase "Where Is Your Heart".
I have liked this song for decades. Located this piano version and share my way with it. My heart is with the song.