In the late 1960s, Miles eschewed pretty much everything that had become associated with jazz - he incorporated electric instruments to the dismay of purists who only wanted to hear acoustic instruments. Electric, don't you know, was only associated with those long-haired hippy freaks who played that lowly rock music. Miles got tired of dealing with the constraints the purists put on jazz musicians and up-ended their conceptions of what jazz should be. By the time he was through with his great Quintet of '65-'68, he had deconstructed his sound and style to a point where "songs" gave way to long, slowly shifting jams. In A Silent Way dropped melody from its concerns, putting more emphasis on the chemistry between instruments and players in long, gentle, free-form movements. If they were somehow still hanging on, hoping for a 'return to form,' purists jumped ship when Bitches Brew was finally issued, bringing to the forefront heavy doses of funk and distorted guitar passages. Big Fun previewed what was to come on A Tribute To Jack Johnson, which took another step into rock territory, putting the wild, improvisatory guitar work of John McLaughlin at centerstage much of the time, while Miles fluttered about on trumpet. The band throughout this material varied greatly, but all players were equally adept at bobbing and weaving around the steady rock-influenced beat and the improvisations going on top of that.

The issuing of The Complete Jack Johnson Sessions, another gorgeously packaged boxset in the tradition of previous Miles boxsets, fills in the blanks left between Bitches Brew, Silent Way, and Big Fun, and his later works that stretched even further out of jazz like On The Corner (with a seemingly unending groove that will do your head in if you're in the wrong mood at the time) and Get Up With It, a release from Miles that still fails to make the impact I always expect it to. I won't even bother to try and review the music - if you know this period of Miles, you need this to put everything else into perspective. If you're not familiar with Miles' 70s output, pick up a used copy of A Tribute To Jack Johnson - there will doubtless be plenty as copies of that disc are traded in to help alleviate the cost of this box. Diving headlong into this period is not advisable - I speak from experience that it took me a while to warm up to it, but I now find this material in my CD player more often than anything else in his considerable catalog, save for maybe the Quintet, 1965-68: The Complete Columbia Studio boxset. There's always something new to be heard in this period, and each release casts the previous releases in a new light and reveals more connections that were invisible previously.