In my most humble opinion, it is incredibly difficult for a band to produce a "sad" sound w/out sounding like they were TRYING to produce that sound. And if they sound like they were trying to produce that sound, it usually does not work for me. The only way that kind of thing works for me (and it usually does not, I prefer VIOLENCE in metal) is when it actually sounds like they produced that sound almost by accident, like it was a natural, unintended, and most importantly, SUBTLE, byproduct. Difficult to explain, but maybe some of you know what I mean...
Regardless, the only thing I can think of that fits the bill would be the album "Hail Lucifer" by BESATT. There are songs on there that make me want to me curl up and die, but it is subtle enough that it does not seem like that is what the band is trying to accomplish.... Anyone know what I mean??
Mike.