None of Miles Davis’ recordings has been more shrouded in mystery than Jack Johnson, yet none has better fulfilled Miles Davis’ promise that he could form the “greatest rock band you ever heard.” Containing only two tracks, the album was assembled out of no less than four recording sessions between February 18, 1970, and June 4, 1970, and was patched together by producer Teo Macero. Most of the outtake material ended up on Directions, Big Fun, and elsewhere. The first misconception is the lineup: the credits on the recording are incomplete. For the opener, “Right Off,” the band is Miles, John McLaughlin, Billy Cobham, Herbie Hancock, Michael Henderson, and Steve Grossman (no piano player!), which reflects the liner notes. This was from the musicians’ point of view, in a single take, recorded as McLaughlin began riffing in the studio while waiting for Miles; it was picked up on by Henderson and Cobham, Hancock was ushered in to jump on a Hammond organ (he was passing through the building), and Miles rushed in at 2:19 and proceeded to play one of the longest, funkiest, knottiest, and most complex solos of his career. Seldom has he cut loose like that and played in the high register with such a full sound. In the meantime, the interplay between Cobham, McLaughlin, and Henderson is out of the box, McLaughlin playing long, angular chords centering around E. This is funky, dirty rock & roll jazz.