Shane MacGowan in his current state is scary in a way.
The poster boy for what happens to you if live a hard R&R lifestyle.
At least he’s sporting some teeth lately. Pictures of him when he was completely toothless are not something you want to see.
This guy didn’t find Danzig intimidating
Do rappers count? Of so, I nominate Bone Crusher.
70’s Todd Rundgren make those guys look like super-models.
Also Rik Ocasek wasnt so hot either.
Costumes and corpsepaint don’t count, IMO; I give y’all Shlak (please don’t watch his videos or listen to his band).
ETA: For the curious, Shlak plays guitar in a wrestling-themed punk/metal band AND is a Death Match wrestler.
Peter Garrett of Midnight Oil Peter Garrett to release solo album in July 14 years after Midnight Oil broke up | Daily Mail Online
Yoko Ono
Joe Cocker was a rough looking character.
Unofficially, Geoff Tate (ex-Queensryche) was. His aunt was an opera singer, and his parents always sang around the house.
Attila Dorn, lead singer for German corpsepaint-wearing power metallers Powerwolf, is an opera singer who joined a metal band.
Floor Jansen of Nightwish was studying/training opera while in school but I don’t know that she has ever performed.
One is scary looking with corpsepaint; the other is not scary and has no corpsepaint, in keeping with the thread. 
That’s lawyer, former Australian parliamentarian and Member of the Order of Australia Peter Garrett to you, sonny …
I’m thinking Bon Scott-era ACDC.
The only thing likely to be more hellish than these two deciding you’d looked at them wrong would be if they decided you were their best mate, and dragged you into whatever evil they had planned after they ran out of canapes.
KISS was kinda creepy / mysterious, what with their makeup and stage antics. That’s nothing compared to what’s underneath. Lest you think I’m being unfair criticizing a group of men in their late 60s / early 70s, they weren’t exactly lookers back in the day.
As far as the ladies, Janis Joplin wasn’t exactly what you’d call a handsome woman.
What, no mention of Marilyn Manson, Alice Cooper, or Ozzy?
Zodiac Mindwarp & The Love Reaction
That’s about the best I’ve ever seen him look!
The HU
(Turn on the Closed Captions to see an English translation of the lyrics.)Ken
Setting a low threshold for “musician.” 