One person says, sings or recites in any language. After the first minute, a second person joins the first one and they say, sing or recite in any language. After the two minutes, a third person joins the first one and the second one, and they all say, sing or recite in any language. And so on...The 'Zaj concert for 30 or 60 voices' from Esther Ferrer (member from group ZAJ since 1966) dated at the beginnng of the eighties in Spain under the aegis of Franco's system. The Concert has been realized in public for the first time in France, initiated by Mattin's invitation during the exhibition 'Noise & Capitalism - Exhibition as concert' at CAC Brétigny on September 25, 2010. Recorded by Eric Maurin & Jean Jacques Palix. Mixed by Mattin. Mastered by Taku Unami.