At that time, with some encouragement from Grigoris Bithikotsis, whom he met at a gathering at his uncle's company at which he sang, Mitropanos visited EMI-Lambropoulos Bros. Ltd.(EMIAL S.A.) There, Takis Lampropoulos introduced him το Giorgos Zampetas, with whom he would work alongside at "Ksimeromata." Mitropanos considered Giorgos Zampetas to be a great teacher and a second father to himself. As he stated, '" Zambetas is the only man in music who helped me without expecting anything. With all my other colleagues, I got something and I gave something in return"". In 1966 Mitropanos met Mikis Theodorakis and sang the Party songs "Romiosini "and" Axion Esti "in a series of concerts in Greece and Cyprus.