These arent in any order really...and these are the usual suspects, I could list tons...

Pink Floyd(my favorite ever)
Opeth
Tool
A Perfect Circle
Black Sabbath
Led Zeppelin
Iron Maiden
Judas Priest
The Doors
The Mars Volta
Kataonia
Ozric Tentacles
Death
Mobid Angel
Nevermore
Nile
Porcupine Tree
SRV
Rush
King Crimson
Yes
Carcass
Between The Buried And Me
Megadeth
Anekdoten
The Allman Brothers Band
Wes Montgomery
Alice In Chains