Carnegie Hall, where he made his debut performing the U.S. premiere of Mikis Theodorakis' Rhapsody for Cello and Orchestra.
# "Swing" is originally by Canadian singer Georgia Murray and its original is named "We'll Never Know" which samples a Greek song "To Treno Fevgi Stis Okto" (English: The Train Leaves at Eight O'Clock) by Mikis Theodorakis.
He has also recorded works by such notable composers as Yorgos Sisilianos, Dimitris Dragatakis, Antiochos Evanghelatos, Dimitri Lialios, Dionysios Lavrangas, Marios Varvoglis, Petros Petridis, Emilios Riadis, Thodoros Antoniou, Mikis Theodorakis, Haris Xanthoudakis, Periklis Koukos, Thodoris Zanas, and many others.
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.
He recorded four or five 45rpm disks for Columbia Records which are now difficult to find, as the singer soon agreed to record for Lyra, for whom he recorded three songs by Mikis Theodorakis.
During the summer of that same year, he auditioned for and won a part in Minoa Vouonaki's play "Sofoklis 'Antigone'", which starred legendary Aliki Vougiouklaki and with music by Mikis Theodorakis.
Spyromilios also agreed to allow the composer Mikis Theodorakis to use his ensemble, along with the popular bouzouki instrumentalist, Manolis Chiotis, and singer Grigoris Bithikotsis, in a premier performance of the Epitaphios, a melodized poetic cycle by the leftist poet Yiannis Ritsos, in Greek radio.
In 1999 and 2000, St. Lawrence Choir performed with the MSO and Charles Dutoit at Carnegie Hall and the Lincoln Center to critical acclaim, presenting works by Faure, Dallapiccola, Szymanowski, Orff, de Falla, and Theodorakis.
The thought and inner need to make guitars sing in a human voice and thus accompany works of great composers such as Mikis Theodorakis, Manos Hatzidakis etc., led him to the foundation of a choir which reached its peak in 1985 when 50 children played with their guitars and sang classic works and songs by Mikis Theodorakis as a dedication to his 60 years.
Mikis Theodorakis used the same melodies that he later used in Canto General.