of Atonal Music'' , in which he extrapolates from the serial theory of Milton Babbitt, proposing a musical "set theory" (set theory (music)) of pitch-class-set analysis analogous to mathematical set theory with the avowed intention of providing a method for the analysis of non-serial atonal music. The musicologist Richard Taruskin and the composer and music theorist George Perle are among the most vocal critics of this method. Forte was also the editor