Aaron Cassidy's recent music moves like a fluid under pressure – viscous, serpentine, and dangerously powerful. Its movements feel unconstrained, spontaneous, driven by external forces that can be dammed and sluiced, at least temporarily, but not truly controlled. But "fluid" here is not just an illustrative metaphor. It points to something quite specific, something fundamental to Cassidy's musical language. Fluids, broadly speaking, flow: that is to say, they move without internal restraint, bound only by the shape of their containers, however that shape may change. Three leading ensembles from the U.S. (the JACK Quartet), Australia (Elision Ensemble) and Europe (Ensemble Musikfabrik) prove that Aaaron Cassidy's work has reached worldwide recognition in the New Music world.