Porgy and bess: it Ain't necessarily so Porgy & Bess:It Ain't Necessarily so 12 Porgy and bess: it Ain't necessarily so / George Gershwin Porgy and Bess:It ain't necessarily so from Sporti' Life Three Songs from Porgy and Bess: It Ain't Necessarily So Three Songs from Porgy and Bess: It Ain't Necessarily So; 5. It ain't necessarily so Porgy & Bess:Summertime - It Ain't Necessarily So It ain't necessarily so 不必如此 （It ain't necessarily so）