sentences:  On August 8, Sonata Arctica formally released a letter naming Viljanen the official guitarist in Sonata Arctica.Liimatainen had apparently not been fulfilling his mandatory civic duties as declared by the Finnish government, and this had caused a rift in between him and the other members of the band.Viljanen took up the mantle as guitarist with much controversy, with many hard-core fans still wanting Liimatainen to be a part of the project.