Maynard James Keenan
Tom Waits
Josh Homme
Justin Broadrick
Lou Reed
Les Claypool
Win Butler
Steven Wilson
Mikael Akerfeldt
Jeff Mangum

**** I've discovered in the last 15 years the question wasn't exactly clear

Three certainly made an impression on you, as you can't even remember their names and I've never heard of a band called Obvs:)

Do u know the singer name off head of fear and the nervous I don't think so

Opeth is Michael and I forgot incubus

Wiki told me in a few clicks, maybe you should try this method sometime.

Anyone who doesn't consider James Dean Bradfield as one of the all time greatest vocalists just hasn't listened to enough good music yet

Robert Plant
 

Legend.

What does "off head of fear" mean?

Asking Alexandria (Danny Worsnip)
 

One of the best male rock/metal vocalist during the past 15 years or so in my opinion is Danny Worsnop, on guitar and vocals with the band Asking Alexandria. Their current single Moving On (power ballad) is all over the airwaves playing at least 4 or 5 different times a day on radio stations.

They are from York, North Yorkshire England formed in 2008. Their lastest album From Death to Destiny was realeased in March of this year.
Worsnop is one of the best vocalist I've heard since Steven Tyler. I was surprised when I read that Worsnop has cited Areosmith as a main influence. Steven Tyler was who he most resembled on vocals when I first heard them.

Here are mine for funzies

1. Mike Patton (Faith No More, Mr. Bungle, Fantomas, Tomahawk, Weird Little Boy, Peeping Tom, General Patton vs The X- Ecutioners, Hemophiliac, The Dillinger Escape Plan, Maldorer, Lovage, Kaada/Patton, Crudo)
2. Freddie Mercury (Queen)
3. Chris Reifert (Autopsy, Abscess, The Ravenous)
4. Jim Morrison (The Doors)
5. Jon Chang (Gridlink, Discordance Axis, Hayaino Daisuki)
6. Kurt Cobain (Nirvana)
7. Ian Gillian (Deep Purple)
8. Peter Steele (Type O Negative, Carnivore)
9. Varg Vikernes (Burzum)
10. Famine and Niege (Peste Noire, Alcest, Dor Daedeloth, Forgotten Woods, Old Silver Key, respectively)

That was off the top of my head.

I don't care about the time limit. Most of these qualify anyway.

Captain Beefheart
Arrington de Dionyso (Old Time Relijun)
Mark Stewart (The Pop Group)
Mike Patton (Mr. Bungle, Fantômas, Faith No More)
Yamatsuka Eye (Boredoms, Hanatarashi, Naked City)
Damo Suzuki (Can)
Keiji Haino
Tom Waits
Sainkho Namtchylak
Maynard James Keenan (Tool)