Neapolitan language
"It's Now or Never" is one of two popular songs based on the Italian song of the Neapolitan language, "'O Sole mio" (music by Eduardo di Capua); the other being "There's No Tomorrow", recorded by U.S. singer Tony Martin in 1949, which inspired Presley's version. The lyrics were written by Aaron Schroeder and Wally Gold. The song was published by Elvis Presley's company Gladys Music, Inc.