American composer Roy Harris was deeply inspired by poetry of Walt Whitman. I recall Roy Harris verbatim recitation of poems from Leaves of Grass during multiple visits to his home.
I HEAR AMERICA SINGING! Choral Music of Roy Harris by The Robert Wesleyan College Chorale, Robert Shewan (conductor) include Roy Harris choral music inspired by poetry of Walt Whitman . See https://www.dramonline.org/
albums/i-hear-america-singing- choral-music-of-roy-harris. Roy Harris last symphony with chorus, the ‘Bicentennial Symphony’, aka 14th Symphony, has been boycotted on concert stages coast to coast since the 1976 premiere with the National Symphony conducted by Maestro Murray Sidlin at the Kennedy Center to celebrate the 200th birthday of our nation.