I was talking with a friend recently about my previous post on Van Morrison and his mood-laden song, “When the Leaves Come Falling Down.” He was telling me how another Morrison mooder, “Melancholia,” is reportedly Morrison’s only truly autobiographical song and, indeed, also represents my friend’s truest and deepest stance toward life. This surprised me a bit, inasmuch as my friend, whom I’ve known pretty well for most of my adult life, presents a rather relentlessly cheerful public persona, far removed from the dark brooding pathos of “Melancholia.” Yet it also put me on notice, again, of the deep sadness…