Conductor Kenneth Woods suggests Aaron Copland's Appalachian Spring as greatest American work:
I came away from the concert more in awe of it than ever- it is so perfectly put together, so deeply moving and so ferociously challenging. America has produced a lot of great music (and Copland produced a lot of that), but Appalachian Spring may be the great work of American music.
Maybe, although Our Town and Four Piano Blues are probably my favorite Copland compositions. And I am still fond for the piano version of El Salon Mexico.