A while ago I considered music as preaching (or vice versa). Peter Leithart has a clear, succinct post considering written or spoken text musically: Hermeneutics: Melody of the Text.
Each word must die for the sentence to live, yet each word must live in memory for the sake of the whole. For a melody, each note must die for the melody to live, yet each remain in memory for a melodic line to form. And so with a whole text, or book: hear the text, and don't miss out the bass drone, repeated rythms, or recurring motifs!
But read it here in Dr Leithart's own words.