Synopsis: How a percussionist dance? How sounds a body dancer? End of 2001, a percussionist-composer (Camille Rocailleux) and a dancer-choreographer (Thomas Guerry) decided to invent a strange journey and fouillent the delicate relationship between music and dance. After six months of creating born "ECHOA" show. In "ECHOA", dance becomes music and the music is also intended to be seen. After more than 450 performances across France, "ECHOA" hand will unveil abroad and transmit emotions outside of its borders. The international tour began in America in the fall of 2009, "Round and round and hand it over..."thus poses gaze on the universality of the language written by piece"ECHOA", its impact, the events it raises. Off stage, we fouillerons the foundations of this design and will discover his choreography at the heart of the urban universe, the source of his inspiration. How, beyond words, "ECHOA" will spread and what will be the scope of its contamination?