1974 was the last full year Miles Davis performed before his years-long hiatus of the late 1970s.This chaotic concert from Carnegie Hall is a fitting conclusion to the trumpeter's era of electric/electronic experimentation. Keyboards are gone, except for Miles' own testy playing of the Yamaha organ, on which he creates washes of harsh dissonance that ground the polyrhythmic improv of three guitarists, two sax players, bassist Michael Henderson, and the ecstatic percussion section of Mtume and Al Foster. If there is one major problem with this concert, it is the lack of compositions .As Dave Liebman writes in the liner notes, there were no melodies beyond a couple of bars, and the harmonic element was extremely minimal, as the group generally worked around a single chord. Miles elsewhere stated that his electrified trumpet was not suitable for the long statements on which his playing was built. If a few sections on each disc seem soggy with noodling, those moments are quickly transcended by ferociously inventive exchanges and a never-ending nervousness that's experienced in abruptly shifting textures and meters. Miles' trumpet sounds elemental, elephant-like.