Thomas Erak; Fantastic guitarist of the progressive scene.
Andres Segovia; Greatest classical guitarists to have ever lived.
Django Reinhardt/Jimmy Smith; To me, two of the most influential jazz guitarists of all time.
MF DOOM; Master lyricist and incredible producer.
Devendra Banhart & Noah Georgeson; Folk guitarists ftw.
Lemmy; white line fever.
ELO; Quite frankly, the greatest band to have ever formed, melted faces, and shatter pelvises

My list is very extensive, but to narrow it down...

Janis Joplin - Her voice...amazing, just amazing.
Flea - One of the great bass gods. He is my main influence on bass and was the one to inspire me to pick a bass up.
Omar Rodriguez Lopez - No traditional music training, but still comes up with the best solos and spontaneous jams I've ever heard.
Jimi Hendrix - Self explanatory, but he's one of my favorites mostly because he pioneered a different way to play the guitar.
Johnny Greenwood - A musical genius in my eyes. He plays, experiments with, and records so many different instruments in amazing ways.

I managed to get it down to 6 musicians.

John Frusciante - great musician (past RHCP there is Ataxia, his solo stuff and Mars Volta collaboration stuff), his playing is pure.
Andy Latimer (Camel)- Pure emotion
Valfar (Windir) - Pure emotion of a different kind.
Robert Fripp (King Crimson) - This guy is a genius
Flea - Bass god
Mikael Akerfeldt (Opeth, Bloodbath) - Marvellous songwriter/vocalist


Jari Mäenpää (Ensiferum, Wintersun) - Marvellous songwriter/vocalist
Chuck Schuldiner (Death) - Marvellous songwriter
Jaco Pastorius - Bass god.
Tony Levin (King Crimson etc)- Bass god, pioneer, etc...
David Bowie - This guy can adapt to anything - I like almost all of his stuff.
Steven Wilson (Porcupine Tree)- Great musician/producer

Jimi Hendrix
Robert Plant
John Lennon
Art Garfunkel