I was listening to the collection and noticed that tracks 1 and 9 as well as 4 and 8 are exactly the same length, so I listen to them sequentially and realized that they are the same two recordings! That is a very clever way to create form from a set of free improvisations. Bravo, this is a really compelling listening experience, I am so glad I bought it. It redefines how I think about sax and flute because of the myriad of atypical sounds you guys get out of the instruments.