Burial Chamber Trio is a drone / doom metal band from United States formed in 2006 consisting of American guitarist / bassist Greg Anderson, legendary Hungarian vocalist Attila Csihar and Australian multi-instrumentalist Oren Ambarchi. These three musicians are also performing with Sunn O))). The band is not to be confused with Gravetemple, which features the same lineup except Greg Anderson; instead, Sunn O)))'s other guitarist, Stephen O'Malley, is in the band.