Pioneers of Doom - 60's-70's early metal

Music started getting a lot heavier and darker at end of the 60's, epitomised by Black Sabbath's first self titled album in 1970, with themes of sorcery and witchcraft and the use of the 'Diabolus in Musica' tri-tone riff they were arguably credited with creating the first metal album. But apart from Black Sabbath there were also a lot of other great artists from that same era of early metal

Here are a few gems...