The best-known song was "Livre", a hymn to the free will and thought as the album was released during the Fascist regime of Oliveira Salazar, against the official censorship.
After that, Freire became a close friend of some of the most influential left-wing musicians like Zeca Afonso, Padre Fanhais or Adriano Correia de Oliveira.
Some years later, still during the dictatorial regime, Freire participated in a TV show, in the only Portuguese station operating at the time, RTP, the "Zip-Zip",[2] singing a poem by António Gedeão called "Pedra Filosofal"[3] ("Philosopher's Stone") that became his most well-known song.
[citation needed] After the Carnation Revolution, in 1974, Freire continued his political action through the music, acting for the working class in several places around the country.
His show, along with the Portuguese folk band Brigada Victor Jara, was an homage to Adriano Correia de Oliveira.