Listen to I Whistle a Happy Tune online. I Whistle a Happy Tune is an English language song and is sung by Deborah Kerr and The Twentieth Century Fox Orchestra. I Whistle a Happy Tune, from the album Two On One Musicals - Kismet and the King and I, was released in the year 2011. The duration of the song is 2:43. Download English songs online from JioSaavn.