Sludge metal

Sludge metal (also known as sludgecore, sludge doom or simply sludge) is an extreme style of music that originated through combining elements of doom metal and hardcore punk. It is typically harsh and abrasive, often featuring shouted vocals, heavily distorted instruments and sharply contrasting tempos. While the Melvins from the US state of Washington laid the groundwork for both sludge metal and grunge in the 1980s, sludge as a distinct genre emerged after 1990 through the work of Louisiana bands such as Eyehategod and Crowbar, who generally borrowed from Southern rock. Later bands often border on stoner rock (e.g. High on Fire) or post-metal (e.g. Neurosis).