Contrapunctus VII from J.S. Bach's "The Art of Fugue"
Contrapunctus VII has long been my favorite piece from Bach's "The Art of Fugue." I remember listening to "The Art of Fugue" (and Contrapunctus VII in particular) when I was in college and thinking to myself, "This is theology expressed directly through music. It is as though Bach is musically portraying the mind of the Deity."