Stoner rock and stoner metal are interchangeable terms describing sub-genres of rock and metal music. Stoner rock is typically slow-to-mid tempo, low-tuned, and bass-heavy. It combines elements of psychedelic rock, blues-rock and doom metal, often with melodic vocals and 'retro' production. The genre emerged during the early 1990s and was pioneered foremost by the Californian bands Kyuss and Sleep. Read more on Last.fm.