Atonality
Atonality in its broadest sense is music that lacks a tonal center, or key. Atonality, in this sense, usually describes compositions written from about 1908 to the present day where a hierarchy of pit...
Atonality - Wikipedia
New Complexity
In music, the New Complexity is a term dating from the 1980s, principally applied to composers seeking a "complex, multi-layered interplay of evolutionary processes occurring simultaneously within eve...
New Complexity - Wikipedia