There have been few vocalists in the history of heavy metal whose singing style has been as influential and instantly recognizable as Rob Halford's. Able to effortlessly alternate between a throaty growl and an ear-splitting falsetto, he became iconic in the '70s and '80s as the frontman for British hard rock rebels Judas Priest. In the late '90s Halford also found icon status in the LGBTQ community as one of the most visible openly gay metal heads after coming out publicly in 1998. Halford's signature howls were the calling card of classic Priest albums like 1980's British St...