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 Deborah Kerr and Marni Nixon. I Whistle a Happy Tune (From "The King and I"), from the album Greatest Musicals Double Feature - The King and I & The Sound of Music (Original Film Soundtracks), was released in the year 2014. The duration of the song is 2:41. Download English songs online from JioSaavn.