In El Dorado, James Caan plays 'Mississippi'. In the movie he recites a poem written by Edgar...

        In El Dorado, James Caan plays 'Mississippi'.  In the movie he 
            recites a poem written by Edgar Allan Poe in 1849 called
                                            Eldorado

                      Gaily bedight,
                       A gallant knight,
                       In sunshine and in shadow,
                       Had journeyed long,
                       In search of Eldorado.

                       But he grew old-
                       This Knight so bold-
                        And o'er his heart a shadow
                        Fell as he found
                        No spot of ground
                        That looked like Eldorado.

                         And, as his strength
                         Failed him at length,
                         He me a pilgrim shadow-
                         "Shadow", he said,
                         "Where can it be-
                          This land of Eldorado?

                           "Over the Mountains
                            Of the Moon,
                            Down the Valley of the Shadow,
                            "Ride, boldly ride",
                            The shade replied-
                            "If you seek for Eldorado".