Music is seasonal. Before Easter, Parsifal. After Easter, Hindemith's When Lilacs Last in the Doorway Bloomd." As natural as the spring.
Whitman's elegy to Lincoln has more music settings than Hindemith's. There is Dobrogosz's, McGrath's, Crumb's, and Session's. These are better tributes than any historian could pen.
Sadly, there is no good reading of the poem itself, apart from this grotesque curiosity. Avert your eyes and listen.