These are remarkable works, not least considering the conditions under which many were written. Some must have been conceived during his many long spells in hospital, or during the time he had to live in dreadful and noisy conditions in a grotty flat in what was a Swedish sink estate. One wonders what drove him to keep churning out music which he might never hear played, and which was unlikely to be understood if it were. They need some work from the listener. Six and seven are the most approachable, seven especially blasting out real and deep anguish in places, and great beauty in others. Nine shows how much can be made from an initial germ of an idea which is really not much more than a bit of a scale. The others I keep returning to in the hope that I might come to sufficient understanding of them to realise why they are so good. I know that they are very clever and logically worked out, but, as with a proof from the Principia, my poor little brain can't always follow what is going on. Buying the lot in one go isn't cheap, but you get a box of music that will keep you listening and wondering for years. You're unlikely to hear any of them in the concert hall, and one listening isn't enough anyway. This is music of great depth and inspiration, masterful orchestration, and for me at least, a great investment.