Listen to It Ain't Necessarily So online. It Ain't Necessarily So is an English language song and is sung by Ella Fitzgerald, Louis Armstrong, Russell Gracia and His Orchestra. It Ain't Necessarily So, from the album Porgy & Bess (The Music Of George Gershwin), was released in the year 2015. The duration of the song is 6:34. Download English songs online from JioSaavn.