This article considers the freedom for the musician that exists within different kinds of music improvisation. It examines the constraints, conventions and parameters within which music improvisations are created and identifies three broad strands of improvisatory practice, that have developed in response to the development of recording technology. It argues that non-hierarchical, pan-ideomatic and structurally indeterminate forms of music improvisation that began to emerge in the late 20th century represent a form of music that models and expresses the felt freedom (...) of the improvising musician. (shrink)