 The term can refer to both a technique (employed by any musician in any genre) and as a recognizable genre in its own right.Free improvisation, as a genre of music, developed in the U.S. and Europe in the mid to late 1960s, largely as an outgrowth of free jazz and modern classical musics.None of its primary exponents can be said to be famous within mainstream; however, in experimental circles, a number of free musicians are well known, including saxophonists Evan Parker, Anthony Braxton, Peter Brötzmann and John Zorn, drummer Christian Lillinger, trombonist George Lewis, guitarists Derek Bailey, Henry Kaiser and Fred Frith and the improvising groups The Art Ensemble of Chicago and AMM.