Here are mine and why.
Randy Rhodes. While mostly known as Ozzy's guitarist. Randy also played 12 string acoustic classical music. About a month or so before he died he did a performance where it was just him and his 12 string.
Alex Lifeson and Neil Peart. 40 years of Rush and so many different styles
Joe Satriani, Steve Vai, Jeff Beck--I put these guys together in one bunch
Yngwie Malmsteen some of his lesser known stuff is his best
Jimmy Page, Hendrix, Clapton--all belong in the same category
Willie Dixon, BB King, Muddy Waters, John Lee Hooker--Without those four --most of the guys mentioned above would not have existed
Gatemouth Brown(saw him play when he was 75--still blowing away guys 1/2 his age), Lightening Hopkins. Son House(if you can get his recordings from the 30s/40sthey will blow your socks off. Elmore Lenard.
Robert Johnson, Blind Lemon Jefferson, Lead Belly,
those are just the Guitarists--will do other spots later