The two semifinal matches in the Greatest Metal Frontman tournament are simply legendary. This iconic battle features two of metal's greatest voices ever!

The late, great Ronnie James Dio's legacy lives on, as his fans have led him on a blazing a trail of victory in this tournament, most recently a win over Slipknot's Corey Taylor with a little over 62 percent of the votes in the quarterfinals. With victories over Marilyn Manson and King Diamond, as well, this semifinal matchup is certainly the toughest one yet for the beloved metal singer.

Iron Maiden's Bruce Dickinson is one of metal's greatest live performers, and his performance in this tournament has been outstanding. He most recently took down Motorhead mainmain Lemmy Kilmister in the quarterfinals with 64.5 percent of your votes. He has also scored wins over Dave Mustaine and Serj Tankian. This matchup against Dio won't be easy, but Bruce always seems to welcome a challenge.

Ronnie James Dio or Bruce Dickinson? Cast your vote for the Greatest Metal Frontman in the poll below! Voting for this round closes on Thursday, Nov. 21 at 9AM ET. Fans can vote once per hour, so keep coming back to make sure that your favorite metal musician wins!