Rap ? Violent words, a social chronicle without complacency at a time of the politically correct and a wishywashy consensus. Twenty years after its first babblings in the popular quarters of New York, rap has imposed its presence beyond the borders. Je rap donc je suis (I Rap Therefore I Am) goes around five different towns where it meets rappers driven by the same motivation. In Paris and its suburbs, Marseille and its districts, Algiers, London or Berlin, rappers move, play, record, teach... And above all, they talk. Outside of any promotional context, the present-day heralds of French hip-hop, from La Rumeur to IAM, speak about the role of rap, the environment in which it was born, boredom, the feeling of belonging to a sacrificed generation, drugs in districts of towns, immigration, parents, political and social actors, the police, school, writing, money, the parallel economy, violence...