She has collaborated with prominent Greek composers such as Mikis Theodorakis, who wrote the score for Pablo Neruda"s Canto General, which Farantouri performed. During the Greek military junta of 1967–1974 Maria Farantouri recorded protest songs in Europe with Mikis Theodorakis. In 1971, she recorded "Songs and Guitar Pieces by Theodorakis" with Australian guitarist John Williams which included seven poems by Federico García Lorca.
She has recorded songs in Spanish ("Hasta Siempre Comandante Che Guevara"), Italian, and English ("Joe Hill" and Elisabeth Hauptmann"s Alabama Song from Bertolt Brecht"s Rise and Fall of the City of Mahagonny), as well as works by Greek composers Manos Hatzidakis, Eleni Karaindrou and Michalis Bourboulis ("San Elektra" and "Tora Xero") in which she realized a special fusion of vocal and instrumental beauty with musical accompaniment by Vangelis.
She also sang the notable "Mauthausen Cycle". Her voice is deep contralto with about an octave and a half range.