Buckethead is a guitar god who wears a white mask and a KFC bucket on his head. He currently has over 120 studio albums ranging from many different music genres (usually some variant of experimental metal)
I've never really followed his work (what I saw/heard was pretty damn good though) but the insane thing for me is his persona that he never seems to take off. I know the whole "fighting against KFC, hence the bucket, by letting the sounds of millions of dead chickens flow out of his hands"-thing and that his character is supposed to be clinically insane with the puppet in interviews and all that, but it's absolutely bonkers that he never breaks character and actually wears the mask for that long. Great musician, seems like a really odd guy.
Buckethead is super weird. I've got a lot of his albums and TBH there's a lot of junk (ie. all of Funnel Weaver) but some absolute gold as well.
Here's some random songs of his I quite like:
Gory head stump 2006: Pagent of the Slunks
All of 'Captain EO's voyage'
We Are One (with Serj Tankian from SOAD)
Korova Binge Bar
Night of the Slunk
Coffin for a penny
Mannequins are my friend
Three Headed Guardian
The Miracle of Surrender (all of 'A real Diamond in the rough' really)
Since he's such a diverse artist (and his stuff scales from amazing to terrible, and also depends at least for me quite heavily on my mood — some stuff took awhile to appreciate as well) I really recommend just getting a few albums and diving in. You'll have to sort the good from the rubbish yourself.
Apparently he also has some albums with Viggo Mortensen (The Road, Lord of the Rings), search youtube for that.
I dig me some Buckethead, but I prefer some other folks when it comes to genres similar to virtuoso instrumental rock/metal guitar. He does have a huge catalog of widely varying music, so there's pretty much something for everyone in there.