They represent such a cool transitional period in Davis's career, as radical a creative juxtaposition to the jazz community as Bob Dylan blowing the minds of the folkies with the crackle of a guitar amplifier.
While hearing the band tear through early takes on pillars from the trumpeter's electric period such as "Miles Runs the Voodoo Down" and "Spanish Key," it's hearing the band upend some of Davis' older material that may be most striking.
For all the stray premonitions of patchouli-scented funk-rock, these are less jazz-rock meltdowns and more muscular free improv sessions, ones which suggest a very different direction from Bitches Brew. [Mar 2013, p.89]
There is a warts-and-all feel to sound quality and some of the improvising, but this is newly emerging and influential music still in the furnace, and Davis's timing can make even a seasoned fan whoop.