 Others consider that modernism ended with one or the other of the two world wars .Still other authorities claim that modernism is not associated with any historical era, but rather is "an "attitude" of the composer; a living construct that can evolve with the times" .Despite its decline in the last third of the 20th century, there remained at the end of the century an active core of composers who continued to advance the ideas and forms of modernism, such as Pierre Boulez, Pauline Oliveros, Toru Takemitsu, George Benjamin, Jacob Druckman, Brian Ferneyhough, George Perle, Wolfgang Rihm, Richard Wernick, Richard Wilson, and Ralph Shapey.