[1][2] He worked with some of the most renowned Greek composers, such as Mikis Theodorakis,[3] Stavros Xarhakos, Giorgos Zabetas, Manos Hatzidakis, Marios Tokas, and Thanos Mikroutsikos.

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 to Giorgos Zampetas, with whom he would work alongside at "Ksimeromata."

[citation needed] In 1966 Mitropanos met Mikis Theodorakis and sang the Party songs "Romiosini "and" Axion Esti "in a series of concerts in Greece and Cyprus.

The composer Dimos Moutsis and the lyricist and poet Manos Eleftheriou released "Agios Fevrouarios" with Mitropanos and Petris Salpeas as the song's performers, marking a milestone in Greek music.

In July 1999, Mitropanos and Moutsis met again on stage at the "Odeon" with Dimitra Galani and the soprano Julia Souglakou for two nights at the Athens Festival.

Giorgos Zampetas, Mikis Theodorakis, Dimos Moutsis, Apostolos Kaldaras, Takis Mousafiris, Christos Nikolopoulos ("Pare Apofaseis" with lyrics by Lefteris Papadopoulos), Yannis Spanos were composers with whom Mitropanos collaborated, building a career intertwined with the Laïko tradition, until the late 1980s.

Mitropanos concluded his concert with a passionate performance of his famous song "Alimono", with all in attendance giving him a standing ovation as he walked off the stage.