 During the 1940s he revised his "Concord Sonata", publishing it in 1947 (an earlier version of the sonata and the accompanying prose volume, "Essays Before a Sonata" were privately printed in 1920).Ives died of a stroke in 1954 in New York City.His widow, who died in 1969 at age 92, bequeathed the royalties from his music to the American Academy of Arts and Letters for the Charles Ives Prize.