Sonata Arctica is a Finnish power metal band from the town of Kemi, originally assembled in 1995. Their later works (most notably The Days of Grays, Unia and a few tracks on Reckoning Night) contain some elements typical of progressive metal.

Sonata Arctica's latest album was released on September 16th 2009 in Finland and September 22nd in the USA. Henrik stated that the new album will be in the same vein as Unia, but not as complex and darker. Singles from this album include "Flag in the Ground" and "The Last Amazing Grays". On August 28, 2009, the music video of "Flag In The Ground" was released to the web. The limited 2CD European edition of the album featured many of the album tracks with all instruments performed by a symphony orchestra.
The band will also be touring with DragonForce for the third U.S. leg of the Ultra Beatdown tour, and will be touring the US "two or three times," as well as doing a European tour and Asian tour covering China, Korea, and Japan.