1. Bruce Dickinson (Iron Maiden): Known for his soaring, operatic vocal style and powerful stage presence, Bruce Dickinson is considered one of the greatest metal vocalists.
2. Rob Halford (Judas Priest): With a distinctive and aggressive singing style, Rob Halford is renowned for his high-pitched screams, vocal range, and energetic performances.
3. Ronnie James Dio (Dio, Black Sabbath, Rainbow): Ronnie James Dio is remembered for his powerful and expressive voice, along with his distinctive songwriting and iconic lyrics.
4. Ozzy Osbourne (Black Sabbath): Known for his distinct vocal style and persona, Ozzy Osbourne has become a legendary figure in heavy metal music.
5. Freddie Mercury (Queen): Although not exclusively a heavy metal band, Queen's Freddie Mercury is recognized for his exceptional vocal range, vocal techniques, and songwriting prowess, making him a notable figure in rock music.
6. Robert Plant (Led Zeppelin): While Led Zeppelin is considered more of a hard rock band, Robert Plant's powerful vocals, bluesy intonations, and charismatic stage presence have left a lasting impact on rock and heavy metal music.
7. Lemmy Kilmister (Motörhead): Lemmy Kilmister's gravelly, throaty vocals and charismatic personality made him a prominent figure in heavy metal, particularly in the subgenre of speed metal.
8. Steve Perry (Journey): Despite Journey being classified as melodic rock rather than traditional heavy metal, Steve Perry's passionate vocal performances and soaring falsettos have earned him recognition as one of the greatest rock vocalists.
9. Geoff Tate (Queensrÿche): Geoff Tate is known for his exceptional vocal range and ability to blend operatic and metal styles, contributing to Queensrÿche's unique sound.
10. David Coverdale (Whitesnake): David Coverdale's high-pitched, soulful voice and heartfelt performances have made him a beloved figure in hard rock and heavy metal.
It is worth noting that this list is not exhaustive, and many other talented heavy metal vocalists have left their mark on the genre. The appeal and preference for specific vocalists can vary widely among heavy metal fans.