All of Robert Fripp's work with King Crimson and w/ Brian Eno: Lark's Tongue in Aspic, Discipline, Beat, Here Come the Warm Jets, Taking Tiger Mountain, Another Green World, Before and After Science, No Pussyfooting, etc.
All of Frank Zappa's work: especially Hot Rats, Shut up n' Play Guitar, Guitar, etc.
John McLaughlin: Bitches Brew, In A Silent Way, The Inner Mounting Flame, etc.
Chick Corea: The Romantic Warrior, Elegant Gypsy, A Night in San Francisco.