This 3CD box set covers less than six months from September 1968 to February 1969. But it is one of the most critical periods in Miles’ career, as he transitions away from the “second great quintet” of Shorter, Hancock, Carter, and Williams. They are all here, to be sure, on the rest of the music from Filles De Kilimanjaro and Water Babies recorded in September and November. But by the time the In A Silent Way LP came into being, the picture had changed to include Chick Corea (electric piano), Joe Zawinul (organ and electric piano), Dave Holland (bass), and most significantly, John McLaughlin (electric guitar).