An 1899 overture by Gustav Holst is named for this man, and Holst also based his "Ode to Death" and "The Mystic Trumpeter" on this man's poetry.  
When Charles Griffes died, he was working on a festival drama based on writings by this author.  William Henry Bell titled his C minor symphony with this man's name, which also names an unfinished choral symphony by Granville Bantock.  Charles Stanford's Elegiac Ode is based on this man's work, as is George Crumb's song-cycle Apparition  and a 1983 cantata by Ned Rorem.  An 1899 overture by Gustav Holst is named for this man, and Holst also based his "Ode to Death" and "The Mystic Trumpeter" on this man's poetry.  Such works as Dona Nobis Pacem and the Sea Symphony by Ralph Vaughan Williams are also based on his writing.  FTP, name this American poet whose elegy for a president was set to music by Paul Hindemith.
When Charles Griffes died, he was working on a festival drama based on writings by this author.  
Walt Whitman