Trios is the first of Carla Bley’s albums to be recorded directly for ECM. Although she has been part of the larger ECM story for forty years, and although much of her life’s work – documented on JCOA and WATT – has been distributed through ECM channels, Trios marks only the second time that Carla Bley and producer Manfred Eicher have been in the studio together (the first occasion being the 1982 recording of Charlie Haden’s The Ballad of the Fallen, for which Carla played piano and wrote arrangements).