I have noticed a lot of "last albums" by bands (even ones where a member isn't about to die soon) are usually thick with... something. Some weird atmosphere that resonates over the whole recording, that isn't present on their other recordings. Listen to "Ice Cream for Crow" by Captain Beefheart, for example. His last album is, arguably, the harshest thing he ever did, and it's particularly mean-spirited at times, like he was stuck in somebody's frownland.
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