for historical purposes, let it be recorded here that this appears to be the earliest example of jazz fusion, as it is understood today, i.e. with guitars. you could make arguments that davis was playing with this style with his work with williams in the "post-bop" style, but there is only one track with a guitar in it on miles in the sky and mclaughlin didn't step in until 1969.

so, yes - it was frank that did it first.

1967:

1968:

however, there is a caveat to this.

mclaughlin was not miles' first choice.

miles wanted hendrix, who couldn't commit.

if miles had talked hendrix into it earlier, he might have gotten this out before frank did, and it might have entirely redefined the concept.

that's not what happened, though - it was frank that did it first, and it's hard not to hear the influence that frank had on what we now call jazz fusion, as a result of it.