At Eurovision in 1970 he represented Spain with Gwendolyne. The official timeline records versions in several languages, foreshadowing a career in which language-specific recordings became an important part of reaching different audiences.

Later releases included Portuguese, French and Italian projects alongside English-language work. Fans comparing recordings should therefore check the language and release edition rather than assuming identically titled compilations contain the same performances.

The Eurovision archive credits Iglesias with both the music and lyrics of Gwendolyne, as well as its performance for Spain in Amsterdam in 1970. It therefore documents him as a songwriter at this early international milestone. RTVE preserves the televised performance dated 21 March 1970, giving listeners an identifiable historical recording rather than an undated clip or a later version of the song.

The Spanish broadcaster’s archive is also useful for seeing the performance in its original television setting. Its date belongs to the contest appearance; a modern archive upload or programme that reuses the footage does not make the performance contemporary.

His own chronology gives concrete examples of the multilingual approach: the Japanese adaptation Anatamo Uramo in 1971, the Portuguese album Manuela in 1975, and French and Italian albums in 1978. The latter are Aimer la vie and Sono un pirata, sono un signore. These were language-specific projects within his career, rather than merely translated marketing titles for one universal album.