When most people think of Davis' foremost ensembles, they instantly hail his first and second great quintets, from the mid-1950s and mid-1960s, respectively. But the sextet on the Cellar Door's bandstand-Davis, saxophonist Gary Bartz, keyboardist Keith Jarrett, electric bassist Michael Henderson, drummer Jack DeJohnette, and percussionist Airto Moreiera- is a sheer marvel of kinetic energy. And adding another dimension of excitement on the final two discs is the blazing guitar of John McLaughlin. With the exception of young Henderson, who had made his bones as a Motown session ace and touring with Stevie Wonder, every member of this Davis band has subsequently proved to be a major figure in jazz, in his own way, each has placed a highly personal stamp on improvisation during the past 35 years.