There is more than one artist with this name:

1) Magnus is a joint dance collaboration of Tom Barman - heart and soul of Antwerp (Belgium) rockers dEUS - and CJ Bolland - DJ-producer and key figure in the international techno scene.

"First one to call Magnus a side-project will get his teeth kicked in by me personally" Barman grins. Their message is clear: Magnus isn't a mere try-out by two different artists, but it is a close and successful encounter between two musicians with radically distinct musical backgrounds, who took it to a recording studio in search of a common sound.

The name Magnus stands for funky, which means party. Thus Magnus bring forth uptempo records that are meant to be played loud.
Magnus originally started out as a three-piece band, but soon Peter Vermeersch – composer, tenor sax and clarinet player of X-Legged Sally and Flat Earth Society – was obliged to step out, due to a busy agenda.

2) MAGNUS were one of the pioneers of the thrashened death metal wave in Poland, formed in 1987. In the 80's, when this genre of metal was born, MAGNUS blazed a trail of an innovative style of fast and heavy play. They were the first band in Poland and one of the first in the world to highlight music with a controversial and rare image, as black uniforms filled with thorns were in those times.
MAGNUS split up in 1997.

3) Magnus are also an experimental pop/rock band from Chicago, United States. They issued Sleepwalker in 2004.

4) Magnus was a straight edge hardcore band from Wilkes-Barre, PA, U.S.A.