Music. Playing as well as listening.
Guess i'd have to say Steve Vai. This guys is a genious in every way. As a guitar player, as a musician and as an artist.
Mostly rock but I like most music actually. Currently listening a lot to Avalyn, John Mayer, Coheed And Cambria, Steve Vai, Dream Theater, Coldplay, Jack Johnson, Neil Zaza, Creed and tons of other names.