Sludge metal is a subgenre of heavy metal music that combines elements of doom metal and stoner rock. It is characterized by slow tempos, heavy guitar riffs, and a thick, murky sound. The genre often features harsh vocals and a focus on dark, introspective themes, creating an atmosphere that is both oppressive and immersive. The origins of sludge metal can be traced back to the late 1980s and early 1990s, with bands like Eyehategod and Crowbar leading the way. The genre has since evolved, influencing various other styles and spawning a dedicated fan base. Sludge metal's unique sound continues to resonate within the broader heavy music scene.