There is more than one artist with this name:
1) Arena is a British progressive rock band founded in 1995 by Clive Nolan and Mick Pointer (drummer in Marillion's original line-up). All of the band's lyrics are written by Nolan.
Musically the band's style ranges from symphonic to hard rock. Some of the band's recent albums have a similar sound to another of the bands that Nolan has participated in, Shadowland.
Guitarist Jonathan "John" Mitchell has been involved in several other projects like KINO (the UK band) Read more on Last.fm