Tracklist Hide Credits
| A | Ahora O Nunca = It's Now Or NeverWritten-By – Aaron Schroeder, Wally Gold |
| B | Un Lio De Blues = A Mess Of BluesWritten-By – Doc Pomus-Mort Schuman* |
Companies, etc.
- Manufactured By – Ifesa
Other versions
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| 47-7777 | Elvis Presley With The Jordanaires | Elvis Presley With The Jordanaires - It's Now Or Never / A Mess Of Blues (7", Single) | RCA Victor | 47-7777 | US | 1960 |
| 447-0628 | Elvis Presley With The Jordanaires | Elvis Presley With The Jordanaires - It's Now Or Never / A Mess Of Blues (7", Single, RE) | RCA Victor | 447-0628 | US | 1977 |
| 47-9314 | Elvis Presley With The Jordanaires | Elvis Presley With The Jordanaires - O Sole Mio (It's Now Or Never) / Make Me Know It (7", Single) | RCA | 47-9314 | Germany | Unknown |
| RCA 1207 | Elvis Presley | It's Now Or Never (O Sole Mio) (7", Single, RE) | RCA Victor | RCA 1207 | UK | 1963 |
| 84-0092 | Elvis Presley | It's Now Or Never / Make Me Know It (7", Single) | RCA Victor | 84-0092 | Brazil | 1960 |

