Memetic Badass/Music

Keith Moon: Perhaps one of the pure concentration of Crazy Awesome in real life.
The Protomen are somewhere between this and Shrouded in Myth. With the band's facepaint, codenames, and some if not all members being robots, it's Justified.
- Panther's singing can melt faces off.
Shawn Drover muffles his bass drum with SOULS.
God created Earth. Chuck Norris created God. Rick Wakeman composed Chuck Norris while drunk out of his skull. His website has a number of good Rick Wakeman facts. (Got everyone in the studio to drink all day, barricaded the bathroom, then mic'd a echo chamber and got people to piss in it at the same time.)
- Of course, Don Francisco taught Rick Wakeman everything he knew...
  - And Don Francisco was created because Earth Herself was bored...
It's scientifically verifiable fact that JAM Project can make anything awesome.
Lemmy
MOTHERFUCKING Slayer is the most badass band this side of Venom!
It's a scientifically-proven fact that Freddie Mercury didn't die of AIDS. Pure epic power simply overwhelmed his body and he ascended back to the higher plane of existence from whence he came.
King of the ocean! Master of the universe! Is it a bird? Is it a plane? No! It's Clarence Clemons!
"Weird Al" Yankovic's 2009 single CNR is all about telling the badass traits of... Charles Nelson Reilly.
- And to purposefully one-up Chuck Norris, the music video displays CNR's trophy room, complete with the mounted head of everyone's favorite Texas Ranger.
David Bowie.
Studebaker Hoch, superhero of the modern economic slump. Unfortunately for him, he forgot an important fact: you don't fuck with Billy the Mountain.
On the Iron Maiden forum Maidenfans, they even founded the Holy Church of Adrian Smith. (note: he's the guitarist)
Snoop Dogg
Herman Li.
Michael Kiske, for Helloween fans. He's on his way to become one^{[dead link]}.
Mark Gormley. That is all.
Most Dream Theater videos on YouTube have exaggerated facts about their playing skills in the comments, but John Petrucci gets the most, partially due to the popularity of the John Petrucci Psycho Exercises videos.
Angela Gossow of Arch Enemy has this reputation, and to a lesser extent, so do all female artists who scream or growl in metal and metalcore bands (see the vocalists for The Agonist, Otep, Walls of Jericho, and Straight Line Stitch for more examples.)