The Bley trios indeed ditto on Lowell Davidson and Don Friedman ditto on Howard Riley; I'd also add his first, "Discussions," from '68 with Barry Guy and Jon Hiseman Irene Schweizer/Peter Kowald/Pierre Favre ("Santana," PIP/FMP) + Schweizer/Uli Trepte/Mani Neumeier ("Early Tapes," FMP) Dollar Brand "Anatomy of a South African Village" (Fontana) Bengt Egerbladh "Schizo" as a primer.