Books on soloing in Jazz Fusion?

Gary Willis has one that you can apply to fusion, which is probably the point of the book. This is a pretty challenging study and can be very tough if you are not up on your theory, but it's doable. His approach to soloing using his method is not as obvious as some other method books since he stresses chord tones vice scales, so it feels like a book on walking bass, but it really isn't. Gary is one of the best improvisors alive on electric bass (IMO) so it's worth it to give it a go. It comes in standard notation, with TAB and a CD, so all bases are covered.

My approach to this (and all) method books it to just go through the whole thing once, not trying to master it right away. That's too frustrating... Just get the jist of it. Then do the whole thing all over again from the beginning. It will go faster the second time and will make more sense. I'm still getting though the first time around, lol.

(click for link) Gary Willis Fingerboard Harmony

 

^^
Also Jimmy Haslip have some books on that subject