The Art of Fugue is loaded with serious musical expression.
Interesting. I find BWV 634 rather uplifting.Liebster Jesu, wir sind hier (BWV 634) from his Orgelbüchlein is almost certainly the most grief-stricken piece of music ever written. The organ is basically crying (heavily) for about two minutes, and then one's left with this queer feeling of utter meaninglessness.