Listen to It Ain't Necessarily So online. It Ain't Necessarily So is an English language song and is sung by Vince Benedetti and Martien Oster. It Ain't Necessarily So, from the album Joyful Sadness / The Music of Vince Benedetti, was released in the year 2011. The duration of the song is 5:33. Download English songs online from JioSaavn.