Cohen was a truly great artist, who happened to be working in the realm of pop music. Although frecuently misunderstood (I've heard it played in church), Halleluja is one of the greatest pop songs ever; my list would include Brian Wilson's God Only Knows, KD Lang's Constant Craving, Paul Mcartney's Yesterday, and Paul Simon's Bridge Over Troubled Water. I note that the greatest and most powerful songs (and musical works of all types for that matter) tend to have a positive spiritual message.
Jeff Buckley - Hallelujah (Official Video) Jeff Buckley apparently internalized this song to the point where it sounds as though he is giving you absolutely everything he has in this performance. A truly awesome marriage of performance and composition.