Listen to I Whistle a Happy Tune (From "The King and I ") online. I Whistle a Happy Tune (From "The King and I ") is an English language song and is sung by Rex Thompson and Marni Nixon. I Whistle a Happy Tune (From "The King and I "), from the album Music at the Movies (Remastered), was released in the year 2013. The duration of the song is 2:41. Download English songs online from JioSaavn.