This is not the first time that Michel Portal and Bojan Z work together. It is true that the collaboration between the two men seems almost obvious. Both unclassifiable, both virtuosos, both so that only totally free jazz had to offer them a complete artistic development field. And even Michel Portal comes from a classical background, standing out in masterful interpretations of Mozart, Schumman, Brahms … led by Boulez or Stockausen. And beyond that, the two men are lovers of trade (we have seen Bojan with Julien Lourau or Henri Texier), fierce encounters that may allow them to discover and immediately invent new languages.