The theme is failed communication between lovers. The song starts in a room washed by shadows from the sun slanting through the lace curtains and ends with the room "softly faded." They are as different as the poets they read: Emily Dickinson and Robert Frost.
Joan Baez included a cover of the song on her 1967 Joan album. She changed one of the lines to "Is the church really dead?" and Simon insisted that a line be inserted on the album's back cover that read: "Paul Simon asks Joan to note that the original line is, 'Is the theater really dead?'"
Les Fradkin has a dramatic version on his 2006 album, Jangleholic.