Tempo/Texture/Dynamics: Changing more than once within a piece and perhaps extremely
Melody: Angular or disjunct/ fragmented (not smooth flowing), based on motifs.
Tonality/Harmony: Use of much dissonance, unusual/ extended chords, modes instead of major/minor.
Instruments: Unusual combinations, electronic instruments etc.
Structure: Not adhering to traditional form
Rhythm/Metre: Metre (time sig.) could change several times, irregular metre (5/4, 7/4), unusual rhythms