In 1971, biographer David Walley noted that "The whole structure of his music is unified, not neatly divided by dates or time sequences and it is all building into a composite".
I 1971 beskrev biografi-forfatteren David Walley at "hele strukturen i hans musik var forenet, ikke nydeligt opdelt af datoer eller tidspunkter, og det spiller alt sammen ind i en samlet komposit".