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Doom metal is a form of heavy metal music that emerged as a recognized sub-genre during the first half of the 1980s. Generally, doom metal features very slow tempos, low-tuned guitars and a much "denser" or "heavier" sound than other metal genres. Both the music and the lyrics intend to evoke a sense of despair, dread, and impending doom.
Musically, doom metal is strongly influenced by the early work of Black Sabbath. A number of their early songs, such as "Black Sabbath" and "Into the Void" are considered embryonic or prototypical doom metal songs.
... Traditional doom metal bands tend to prefer clean vocals, often patterned off Ozzy Osbourne's on early Black Sabbath recordings or operatic vocals, like Candlemass' former singer Messiah Marcolin or Solitude Aeturnus' Robert Lowe. Doom bands with extreme metal influences tend to favor the growls, shrieks, and screams common in death metal, black metal, and thrash metal. Some sludge bands incorporate the harsh strained vocal style commonly found in hardcore and crust.