Korni Grupa — who took note of young Čolić's "clean tenor and good stage presence" Ambasadori also expanded their repertoire so that in addition to R&B they now also began playing covers of Led Zeppelin, Blood, Sweat & Tears, Creedence Clearwater Revival, etc. In the summer of 1970, Ambasadori scored a month-long gig with Indexi in Dubrovnik, their first tour-like experience and a taste of life on the road. A year later, during summer 1971, Kovač finally met up with Čolić by coming to an Ambasadori gig in Mostar. He quickly managed to convince the young singer to move to Belgrade and join his Korni Grupa as replacement for Dado Topić. Ismeta Dervoz years (1972–1976) After Čolić left, eighteen-year-old became the new Ambasadori vocalist. Dervoz's only previous musical engagement of note had been singing for cover band Kodeksi. Dervoz's first live appearance with Ambasadori came at the 1972 Skopje Festival where they performed the Kemal Monteno-written-and-composed song "Sviraj mi, sviraj". The same year, Jugoton released their 7-inch single "Poslednja serenada" / "Idila jednog mačka" / "Hej, vi" with Dervoz on vocals on each of the three tracks. In 1973, in line with SFR Yugoslavia's new policy of decentralization, Diskoton music label was established in Sarajevo with Ambasadori bandleader Vujović appointed as its top executive. During fall 1973, Ambasadori went on a tour of the Soviet Union. In early 1974, twenty-six-year-old Diskoton chief executive Vujović rejected a fledgling local band called Bijelo Dugme, a move that would go down in Yugoslav popular music history as an example of a bad judgement call after they signed a long-term deal with rival label Jugoton and immediately went on to nationwide fame with millions of records sold. In 1975, Ambasadori scored a sizable hit with their entry at that year's festival — Kemal Monteno-written patriotic schlager song , inspired by and dedicated to Yugoslav gastarbeiters leaving their homeland in search of expanded employment opportunities throughout Western Europe. Finishing fourth among the sixteen competitors, they additionally won the festival's interpretation award while the main prize went to Zdravko Čolić, their former singer who had recently gone solo, and his song "Zvao sam je Emili". Ambasadori represented SFR Yugoslavia at the 1976 Eurovision Song Contest in The Hague with song "Ne mogu skriti svoju bol" (written by Slobodan Đurasović and composed by Vujović), finishing second last among the 18 participating countries. Their disappointing finish caused a