Porgy and Bess is a studio album by jazz vocalist and trumpeter Louis Armstrong and singer Ella Fitzgerald, released on Verve Records in 1959. The third and final of the pair's albums for the label, it is a suite of selections from the George Gershwin opera Porgy and Bess. Orchestral arrangements are by Russell Garcia, who had previously arranged the 1956 jazz vocal recording The Complete Porgy and Bess.

"It Ain't Necessarily So" is a popular song with music by George Gershwin and lyrics by his brother Ira Gershwin. The song comes from the Gershwins' opera Porgy and Bess (1935) where it is sung by the character Sportin' Life, a drug dealer, who expresses his doubt about several statements in the Bible. The song's melody also functions as a theme for Sportin' Life's character.