A battle of titans, a clash of the titans. Because in the world of improvised jazz, a saxophone duo is relatively rare. They are generally more inclined to play with a drummer, a bassist or a violinist, but rarely with each other. They are two heavyweights: Gustafsson has played with Jim O'Rourke, Sonic Youth, Derek Bailey while Stetson is a monument. A meeting at the Vancouver Jazz Festival in 2011, here transcribed on CD, leaving the listener stunned, facing this dialogue of prodigies, this dexterity in the expression of their energies.