In 1981, they released the single "Sharazan", which went on to become their breakthrough international hit, and released a Spanish language album. In 1982, the duo broke Italian records by having four songs on the Italian hit parade at the same time. The same year, they participated in the Sanremo Music Festival with the song "Felicità", and finished second. The song became widely popular, selling in over 6 million copies and receiving "German Golden Globe 1982". It appeared on their next album, "Felicità" (released as "Aria pura" in some territories), which was a chart success. The album was also recorded in Spanish and released as "Felicidad". The duo would maintain the tradition of recording Spanish versions of their albums in the following years.