Experimental composer Charles (4)

I believe the answer is:

ives

(Other definitions for ives that I've seen before include "Saint of Cornwall or Cambridgeshire" , "Charles -, American composer (The Unanswered Question)" , "St -, Cornish resort" , "US composer, Charles" , "US composer, d. 1954 - US folk singer, d. 1995" .)

I've seen this clue in The New York Times.

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