The usual for music. The Beatles when I was a kid, then later KISS and others inspired me to pick up and play guitar. Heard Van Halen and my life changed. Add in Blackmore, Page and of course Hendrix. Schenker was a biggienin those years as well.
Vocally Dio, Plant from the early days, and a host of others from back in the day when guys had more than a 1.5 octave range. More recent would be Maynard James Keenan, Corey Taylor, and a boatload of rhe female vocalists who sing with more guts than most of th current guys. (Alissa White-Gluz and before her Angela from Arch Enemy and Melissa Bonnie from Rage of Light, and Brittany Hayes from Unleash the Archers for example. They make the guy from 5 Finger DP sound like a fool IMO.)
And by far my favorite of the virtuoso guitarists is Steve Vai. He has the combination of being highly educated musically and dedication to a good lifestyle and attitude of humility that gives him an edge over the guys who know the rules and still use them.
On another note, I would add Lao Tzu, Bruce Lee, Buddha, and Tesla (not the band) to the list of those who had a huge influence on me and that has affected my approach to music and most everything in life. Music is after all about communication and emotion and has little to with technical prowess. (Unless you just want to impress other musicians.)