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In the early 1990s, doom metal's popularity grew greatly, and two unique styles developed. The old school imitation of 1970s bands was picked up by stoner metal groups, while a New Orleans metal scene developed a gothic rock/doom metal hybrid that came to be known as sludge metal.
The Doom metal have two more main sub-generes, Doomdeath and Gothic Metal. Doomdeath metal is a mixture of slow creepy doom riffing with death grunts and screams instead of using "vampiric" clean vocals.
Goth metal, originally evolved from doom metal and now stands on its own, is taking the slow heavy doom riffing and mixing it with melodic\\gothic elements such as female vocals, melodic keyboards and gregorian chants. The gothic doom metal is usually more quiet and slow then Scandinavian Goth metal and use less special elements. It focuses more on atmosphere than on technique and lyrics. Representive bands of gothic doom metal are Tristita, Ashes You Leave and Paradise Lost, often classified (rightfully) as Gothic Metal bands.