As the dust settles on a week of intense urban violence triggered by the police shooting of a young man in the northern working-class suburb of Nanterre, we look at the causes and what, if anything, has changed in these poorer, multi-racial neighbourhoods since the 2005 riots. What role has police violence played in the worsening relations between the state and banlieues residents? And the life and music of singer-poet-anarchist Léo Ferré.