Listen to It Ain't Necesserily So (From "Porgy & Bess") online. It Ain't Necesserily So (From "Porgy & Bess") is an English language song and is sung by Sammy Davis Jr.. It Ain't Necesserily So (From "Porgy & Bess"), from the album Greatest Musicals Double Feature - Porgy and Bess & Carmen Jones (Original Film Soundtracks), was released in the year 2014. The duration of the song is 3:04. Download English songs online from JioSaavn.