Edge of Sanity was a Swedish progressive death metal band whose work often delved into experimental territory. Edge of Sanity are regarded alongside Opeth as being the first to fuse extreme metal styles like death and black metal with genuine progressive rock. Having formed in 1989 in Finspång, Sweden, Edge of Sanity asserted themselves as a solid death-metal outfit with their debut release "Nothing but Death Remains", but their second release "Unorthodox", with tracks like "Enigma" and "When All Is Said", showed them branching out from some of the genre's conventions.

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