Listen to Rockin' In Rhythm online. Rockin' In Rhythm is an English language song and is sung by Ella Fitzgerald and Duke Ellington & His Orchestra. Rockin' In Rhythm, 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 5:21. Download English songs online from JioSaavn.