Gary Moore wasn't the first guy to strap on a Les Paul and plug it into a Marshall, but he injected something special into that equipment combination. From wikipedia:
Gary Moore (born Robert William Gary Moore, 4 April 1952, in Belfast, Northern Ireland) is a guitarist. In a career dating back to the 1960s he has played with bands/artists including Thin Lizzy, Colosseum II, Greg Lake and blues-rock band Skid Row as well as having a successful solo career.
Moore started performing at a young age, having picked up a battered acoustic guitar at the age of eight, and got his first quality guitar at the age of fourteen, learning to play the right-handed instrument in the standard way despite being left handed. His career has lasted over thirty years.
Gary Moore now appears as a regular radio host every Sunday and Monday on 'Planet Rock' radio. His show is entitled 'Blues Power' and plays many classic blues tracks, as well as some of Moore's own tracks.
Gary added an element of . . . I guess, precision to the rock lexicon. He rocked as hard as all the acolytes of Clapton, Beck, & Buddy Guy from the '60s, but was somehow smoother and more polished. The level of virtuosity was raised, without sacrificing any of the "soul".
Here's a video of Gary during his Thin Lizzy days:
And here he is with Thin Lizzy's Phil Lynott doing the overblown yet delicious "Parisienne Walkways" live:
And finally, here's Gary more recently, in '04, paying homage to Jimi with "Red House", with bassist extraordinaire Pino Pallidino:
And best quote ever from YouTube comments:
Shit, if I could play like that, I'd have my head shaved, my balls out, be drunk all the time and wear rabbit slippers and I'm pretty sure people wouldn't notice!