His first public appearance as a singer was in Turkish under contest for Eurovision Song Contest 1975.
Sergio y Estíbaliz took part in the Eurovision Song Contest 1975 and reached 10th place with their greatest hit Tú volverás, released in English as You'll Return.
In 1988, they participated in the Turkish under-contest for the Eurovision song contest by their song "Resimler Resimler", but they couldn't win the contest.
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He twice participated in the Eurovision Song Contest; in 1975, he conducted the first ever Turkish entry, "Seninle Bir Dakika", that had been composed and arranged by others.
West Germany (performing under the banner Germany) was present at the Eurovision Song Contest 1975, held in Stockholm, Sweden.