Mustis, is the pseudonym of Øyvind Mustaparta, a Norwegian keyboardist, best known for his work in the Norwegian melodic black metal band Dimmu Borgir. Mustis joined Dimmu Borgir in 1998 and contributed to their atmosphere with his melodic keyboard parts. This can be heard in songs such as Progenies of the Great Apocalypse (which he composed) on their Death Cult Armageddon album (released in 2003 with Nuclear Blast). He hasn't played in any other bands previous to Borgir and had his first live performance at the Dynamo Open Air festival in the summer of 1998.

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