Can You Guess Which Rocker This Mustache Belongs To?

This thinly sculpted mustache comes from one of rock's guitar greats, who got his start in such bands as the Rockin' Chevrolets, The Rest and Mythology before finding fame playing something where the output sounded a wee bit louder than his first three bands.

Do you have a guess yet on whose mustache this is? Here's another hint: He once joined Jethro Tull, but left the band after one gig. Do you have a clue as to who the man behind the mustache might be?