Listen to In a Mellow Tone online. In a Mellow Tone is an English language song and is sung by Oscar Peterson Trio. In a Mellow Tone, from the album Caravan (The Music Of Duke Ellington 1930 - 1957 - 75 Tracks), was released in the year 2015. The duration of the song is 3:09. Download English songs online from JioSaavn.