Hatzidakis's first composition was the tune for the song "Paper Moon" ("Χάρτινο το Φεγγαράκι"), from
Tennessee Williams'
A Streetcar Named Desire staged by
Karolos Koun's Art Theatre of Athens. His first piano piece, "For a Little White Seashell" ("Για μια Μικρή Λευκή Αχιβάδα"), came out in 1947, and in 1948 he set a collection of Gatsos poetry to music:
Blood Wedding. Hatzidakis focused on the economy of expression, the deep traditional roots and the genuineness of emotion displayed in rembetika, and exalted the likes of composers like
Markos Vamvakaris and
Vassilis Tsitsanis. Putting theory to practice, he adapted classic rembetika in his 1951 piano work,
Six Popular Pictures (
Έξι Λαϊκές Ζωγραφιές), which was later also presented as a folk ballet. Also in 1949 he co-founded the Greek Dance Theatre Company with the choreographer
Rallou Manou. At this point he began writing immensely popular songs and movie soundtracks alongside more serious works, such as 1954's
The C.N.S. Cycle (
O Kyklos tou C.N.S.), a song cycle for piano and voice. In 1955 he wrote the score for
Michael Cacoyannis' film
Stella, with actress
Melina Mercouri singing the movie's trademark song "Love that became a double-edged knife" ("Αγάπη που 'γινες δίκοπο μαχαίρι"). He composed the score for the 1955 film Laterna, ftoxia kai filotimo "Λατέρνα, φτώχεια και φιλότιμο" In 1958, Hatzidakis met
Nana Mouskouri, his first "ideal interpreter". It was 1960 that brought him international success, as his song "
Never on Sunday" ("Τα παιδιά του Πειραιά"), from
Jules Dassin's film
Never on Sunday (Ποτέ την Κυριακή), won him an
Academy Award and became a worldwide hit. Hatzidakis did not attend the Academy Award ceremony in 1961, and refused to collect his award. He said that the film
Never on Sunday with a prostitute as its protagonist reflected negatively on Athens. and completed his score for
Aristophanes'
Birds (
Όρνιθες), another Art Theater production which caused an uproar over Koun's revolutionary direction. The score was also used later by
Maurice Béjart's
Ballet of the 20th Century. He also wrote the music for a song which
Arthur Altman added English lyrics to and gave to
Brenda Lee. The song was "
All Alone Am I". In 1964, he released the album
15 Vespers (
Δεκαπέντε Εσπερινοί) with the famous song "Mr Antonis ("Ο Κυρ Αντώνης"). In 1965, his
LP ''
Gioconda's Smile (Το Χαμόγελο της Τζιοκόντας
) was released on Minos-EMI. The album was re-released in 2004, digitally remastered as an audiophile LP and a CD in the EMI Classics collection. In 1966, Hatzidakis travelled to New York City for the premiere of Illya Darling, a Broadway musical based on Never on Sunday'', which starred Mercouri. ==Living outside Greece==