* Use of more dissonant chords
* Use of altered chords
* Use of extended chords
* Use of polychords
Melody:
* Use of more chromatic melodies
* Use of more angular melodies
* Use of more syncopated melodies
* Use of more extended melodies
Rhythm:
* Use of more complex rhythms
* Use of more syncopated rhythms
* Use of more polyrhythms
* Use of more irregular rhythms
Texture:
* Use of more complex textures
* Use of more counterpoint
* Use of more orchestration
* Use of more electronics
Form:
* Use of more complex forms
* Use of more open forms
* Use of more aleatoric forms
* Use of more experimental forms