1. Ronnie James Dio: Great powerful voice with excellent grit and passion. Pretty good range even though it isn't as high compared to singers like Bruce, Rob Halford, Michael Kiske ect. But, that doesn't matter when your voice is this golden. May he rest in peace.
Ronnie at his peak doing a vocal solo with Rainbow leading up to "Man on the Silver Mountain"
2. Bruce Dickinson: Seeing as we're all Maiden fans I see no need to go into too much detail. Great voice with power and excellent range and the best front man in metal history.
This video shows Bruce's belts, screams, and lower range.
3. Robert Plant: The prototype for a heavy metal singer with a unique voice. Later in his career, he started losing his voice but he adapted beautifully.
Vocal track from his best performance "Ramble On"
4. Freddie Mercury: I feel dirty for putting him at Number 4 instead of 1 or 2 but, this is my personal preference, not an official ranking of skill. Freddie has a range that people would kill for, he influenced so many people including Rob Halford, Bruce Dickinson, Geoff Tate and even some Opera singers.
This video showcases how diverse Freddie's voice was.
5. Rob Halford: FINALLY! The Metal God makes an appearance on my list! Rob arguably has the highest range out of anyone on my list and he can hit notes that only dogs can hear unfortunately, due to age he can't hit the notes he was able to back in his peak.
The video above is what I believe to be his best vocal performance. It really shows off his lower range as well as his upper register.
6. Ian Gillan: The REAL voice of Deep Purple (No offense to David Coverdale) Many people consider him to be the first metal singer seeing as how he used his signature shrieking technique on tracks like Child in Time, Highway Star, Fireball and Into the Fire. Bruce Dickinson cites Ian as his biggest influence.
http://youtu.be/ADdf131i93w
This video showcases Ian's screams, cleans and beautiful range.
7. Chris Cornell: Chris Cornell is basically Robert Plant Number 2 Despite being a baritone, he's able to hit stratospheric tenor notes. After leaving Soundgarden, he lost some power and range with his voice but, he seems to have gotten it back.
http://youtu.be/8gA5MYU85Ow
This video shows Chris's Range (or Rage)
8. Layne Staley: One of the most unique voices ever, Layne is known for his chilling harmonies with guitarist Jerry Cantrell. The way Layne pours out his soul in every note is unparallel.
http://youtu.be/z5HgcS4AnlI
Great video showcasing his power and emotion
9. Michael Kiske: Best known as former Helloween singer Michael was influenced by Bruce Dickinson after hearing "Run to the Hills" on German radio as a child Kiske began singing at a higher range as opposed to singing like his other idol Elvis Presley.
10. Geoff Tate: Known as the singer for Seattle based progressive metal band Queensryche, Geoff has/had a wide and powerful range. As of late, his live vocal flopps and acts of bashing former band mates has caused him to lose some credibility
http://youtu.be/KYgGDW334i8 Showcasing Geoff's wide range.
11. Russell Allen: Best known as vocalist for Prog/Power Metal band Symphony X, Russell has a great range
12. Myles Kennedy: Vocalist for Hard Rock/Alt Metal band Alter Bridge, Myles has a wide range and unique voice that is instantly recognizable. Myles gained even more recognition when he was chosen by Slash to be his main vocalist.
13. Steven Tyler: Tyler has an amazing voice but, the reason he's low on my list is because I'm not a big Aerosmith fan. Even so, Steven is a great singer and his performance on songs such as "Dream on" and "Living on the Edge" are legendary.
14. Axl Rose: A high range, unique voice and great lower regastire. What's not to love? Maybe the fact he's a jackass and has sucked live for the past decade or more? Even with that being the case, Axl is a great vocalist and worthy of being on this list.
15. King Diamond: All hail the King! King Diamond has a legendary falsetto that is often imitated but never bested. The only thing that makes him low on the list is the fact that he's kinda a one trick pony. (Even though I love the trick)