Dr. King's "I Have a Dream" speech is one of the most moving and powerful exhibitions of public oratory one can experience. I hope that it remains a part of public memory for at least as long as Pericles' funeral oration has. While Dr. King's speech by itself has memorable rhythmic and lyrical intensity, for me, these features are rendered sublimely by Max Roach's posthumous duet "The Dream/It's Time," in which Roach accompanies King on drums.
The piece is on the out-of-print album Chattahoochie Red (Columbia). There's a partial video clip here. It's time for the album to be re-released on CD.