ビッチェズ・ブリュー
The technology of recording, analog tape, disc mastering and inherent recording time constraints had, by the late sixties, expanded beyond previous limitations and sonic range for the stereo, vinyl album and "Bitches Brew" reflects this. In it are found long-form performances that encompass entire improvised suites with rubato sections, tempo changes or the long, slow crescendo more common to a symphonic orchestral piece or Indian raga form than the three-minute rock song. Starting in 1969, Davis' concerts included some of the material that would become "Bitches Brew".