Comecon was a Swedish death metal project founded in 1990. The band consisted of two guitarists, a drum computer and a session singer; a different one on each album. The debut album featured the Swede Lars-Göran Petrov, who was then dismissed from Entombed. Their second album was sung by Dutchman Martin van Drunen (Asphyx). German Marc Grewe, from Morgoth handled the vocals on their final album. All three albums were produced by Tomas Skogsberg.

Source: Wikipedia (https://en.wikipedia.org/wiki/Comecon_(band))