I have this thought, that Opeth, while inaccessible at first, becomes the ultimate form of easy-listening later (in a positive sense) - for a person interested in music, of course. It takes some amount of time to figure out their ways of expression, embodied in their compositional structures; but when you've already learnt to think on their wave, Opeth's music is rather relaxing to the intellect, while being still emotionally intense. The reason is hidden in their formula - each new element (riff/interlude/dynamic change) introduces a new emotion or a new image, but as opposed to developing the theme, Opeth settle on repeating it a few times - this music always leaves enough space for the listener to catch up on the feeling in case she missed it for the first time around. As opposed to constantly developing music (like classical, for instance), where the listener must find her own (hard) way and is not given time to relax and take a breath. This, again, is a statement from a general musical viewpoint, not related to local "Opeth/In Flames" or "metal/pop" comparisons. Okay, now that I've set this thesis up , I want it to be challenged and ripped to pieces!