Listen to Secret of Happiness (From "Daddy Long Legs") [Piano Accompaniment] [Karaoke Backing Track in Eb] online. Secret of Happiness (From "Daddy Long Legs") [Piano Accompaniment] [Karaoke Backing Track in Eb] is an English language song and is sung by Pianotrax. Secret of Happiness (From "Daddy Long Legs") [Piano Accompaniment] [Karaoke Backing Track in Eb], from the album Musical Theatre, Vol. 1, was released in the year 2017. The duration of the song is 2:39. Download English songs online from JioSaavn.