Unlike other heavy metal which tends to have a louder, faster tempo, doom metal's purpose is to deaden. To take music and make it heavier using lower toned guitars and distortion to make the sound surreal and disturbed. The use of vocals ranges from the high-pitched operatic voice to a low growl with the most common instruments of the genre being the electric and bass guitar. The theme of the music typically matches its tone, focusing primarily on the depressing - pain, famine, drugs, and death.
The pioneer for doom metal was, without a doubt, Black Sabbath. Instead of the quick, upbeat music that was prevalent at the time, Black Sabbath focused on the dark creating a sound full of pain and pessimism. In the 1980s, the genre began to gain popularity with other bands emerging such as Witchfinder General and Pentagram. In the beginning, the bands primarily originated from the United States and Britain although the genre began to spread to all over the world with bands arising in countries such as Germany, Sweden, and Japan.
There are currently hundreds of bands throughout the world such as the Wreck of the Hesperus from Ireland and Valkyrie from the United States.