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Suddenly struck by how the opener, "Don't Get Too Hip", prefigures Clark's own "Cool Struttin'", recorded a few months after, both the horn's theme and Sonny's solo.
Happened upon this Greek (!) documentary where Bley tells his story (notably his adoption story and encounters with Charlie Parker, Ornette, Mingus, etc.) while walking around Montréal:
Πώλ Μπλαίη - Paul Bley "Οι μουσικοί του Κόσμου" Αφιέρωμα (1932-2016) - YouTube