My oldest brother turned me on to Light As A Feather - Chick Corea.
I've been trying to play "Spain," from Return to Forever, ever since.
Bill Conners and Al Dimeola set the bar high.
I loved what John McLaughlin did for Carlos Santana: really got him to the next level.
Actually I love all these groups, but Return to Forever won my vote by the tiniest of margins.
For Fusion guitar I like Larry Coryell, but he didn't make the Miles Alumni. Mike Stern did though.