My favourite Joni Mitchell song (though, thankfully, no-one’s forcing me to choose) is from the 80s. ‘Two Grey Rooms’ is about a narrator who rents a flat so that they can watch somebody walking to work, someone who used to be their lover, though he or she looks to be too young. You look so youthful/time has been untruthful/heaven knows, I loved you thirty years ago. Joni once told the LA Times the song was inspired by a story from the youth of the German film director Rainer Werner Fassbinder. ‘It’s a story of obsession… about this German aristocrat who had a lover in his youth that he never got over. He later finds this man working on a dock and notices the path that…