A foreshadowing of the area between rock and jazz that he would further explore with 1970's hypnotic Bitches Brew, this was Miles' first album to feature a full-blown electric approach. Incorporating elements of classical sonata form, both of the lengthy cuts featured here defy convention with 3 distinct "movements" in which harmony, rhythm and melody take a back seat to impressionistic texture. Listen closely, and you can hear the earliest inklings of modern-day fusion on Shhh/Peaceful and the equally spacey in a Silent Way/It's About That Time.