You could do that with any albums from Opeth. Deliverance and Damnation ARE seperated and they sounds very different. I don't think we should link them together this way (even if I don't really care). Facts are that Deliverance is one very dark album and Damnation is a mellow album, like you said. I don't like Orchid so much, but I put Orchid and Morningrise together, so now I love Orchid. Erm.