Katatonia is a Swedish doom metal band formed in Stockholm in 1991 by Jonas Renkse and Anders Nyström. The band started as a studio-only project for the duo, as an outlet for the band's love of death metal/doom metal. Increasing popularity led them to add more band members for live performances, though outside of the band's founders, the lineup was a constantly changing, revolving door of musicians throughout the 1990s, notably including Mikael Åkerfeldt of the band Opeth for a period.