I suspect we may be at the end of the age of the canon, for now at least. For all those mixed bills at festivals, and playlists that place Beyoncé next to Black Midi, I suspect best-ever lists, from here on, will be specialised. They are more likely to go by genre, in specialist titles: the best hip-hop album ever, the best metal album ever, the best electronic album ever. It’s simply easier to do it that way than to attempt to evaluate the relative worth of Lemonade against Led Zeppelin IV.