Listen to It Ain't Necessarily So (From "Porgy & Bess") online. It Ain't Necessarily So (From "Porgy & Bess") is an English language song and is sung by Colm Wilkinson. It Ain't Necessarily So (From "Porgy & Bess"), from the album The Essential, was released in the year 2016. The duration of the song is 3:32. Download English songs online from JioSaavn.