Heard it on the Ægean.
It describes the "eternal note of sadness" and that "Sophocles long ago / Heard it on the Ægean." While the Sea of Faith was once everywhere, one can now only hear its "melancholy, one, withdrawing roar." It is what you hear if you would come to the window when "The sea is calm to-night./ The tide is full, the moon lies fair / Upon the straights...." For ten points, name this poem by Matthew Arnold.
It describes the "eternal note of sadness" and that "Sophocles long ago /
"{Dover Beach}"