Charles —, American modernist composer of the four movement A Symphony: New England Holidays (4)
I believe the answer is:
ives
(Other definitions for ives that I've seen before include "US composer, d. 1954 - US folk singer, d. 1995" , "Saint of Cornwall or Cambridgeshire" , "he composed" , "Charles -, American composer (The Unanswered Question)" , "This classical composer" .)