On 9 April 1956, Dalida participated in the singing contest Les Numéros 1 de demain, performing Etrangère au Paradis. Prior to the competition, Eddie Barclay, owner of the largest recording house in France, Barclay, and Lucien Morisse, artistic director of the newly established radio station Europe n°1, met in Bar Romain (now Petit Olympia) and discussed what to do that evening. Barclay wanted to watch a film, whereas Morisse wanted to attend the singing competition, which was being held at Olympia Hall, then the largest venue in Paris. They settled their disagreement by playing 421, a dice game, which Morisse won. Together with their friend Coquatrix, they were greatly impressed after Dalida won the contest, and arranged a meeting with her. That event was later perpetuated in biopics and books, and became regarded as fateful for Dalida's career. The three men went on to play a large part in launching her career.
After competing for four months at Canzonissima, then the most popular TV show in Italy, in January 1968 Dalida won with "Dan dan dan" that reached number two in Italy. Dalida also came back to film for her first main role in five years, in Italian romantic drama Io ti amo, acting as stewardess Judy alongside Alberto Lupo. The movie was a minor success, but as it was filmed in colour and several of her new songs appeared in, it provided critically acclaimed music video for her latest Italian chart topper and gold certified "L'ultimo valzer". After the filming, Dalida embarked upon a two-year-long world tour that extended until early 1970. With more than 300 live performances it was Dalida's longest tour up to that moment and, as a part of it, in summer 1968 she participated in a popular Italian summer festival Cantagiro and won the main prize. In 1969, during the third leg that started on 9 January in Milan, for the first time in career Dalida performed in Yugoslavia and in lower parts of Africa. After Gabon in December and in Tahiti in January 1970, the tour ended in Iran in February. 2b1af7f3a8