“A guide to György Ligeti’s music”

Why does it sometimes feel like every 20th century composer had a new gimmick every few years?

Ligeti’s principled resistance of system-for-system’s sake – whether Boulez’s version of serialism, Cage’s chance, or Xenakis’s stochasticism – meant that he had to find new forms, new kinds of expression, in virtually every new piece he wrote.