I'm researching Paul Motian tunes that were improvised and have no lead sheets for the Songbook Volume 2. There were a handful mentioned in Volume 1 but there are many from 1990- 2011. Some of the players are Marilyn Crispell, Paul Bley, Charlie Haden, Masabumi Kikuchi, Enrico Pierinunzi, Gary Peacock and more. I'll be listening for similarities and differences. Let me know what you hear.