Sonata Arctica
In 2000, he joined "Sonata Arctica" and toured Europe with "Stratovarius" and "Rhapsody". Härkin recorded keyboards for "Sonata Arctica's" second album, "Silence", which was released in 2001. "Sonata Arctica's" first live CD, named "Songs of Silence", featured Härkin on keyboards. At the end of 2002, Härkin left "Sonata Arctica".