Härkin begun to study piano at the age of 5. He joined Kenziner in 1998 and with them recorded his first album, The Prophecies.
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.[citation needed]
In 2003, Härkin started a band named Wingdom with vocalist Sami Asp, Alessandro Lotta (ex-Rhapsody), Markus Niemispelto, and guitarist Jukka Ruotsalainen. In 2005, Wingdom' released their first album, Reality.[2] Afterwards[when?], the band Divinefire invited Härkin to play keyboards on the album Hero.[citation needed]
Härkin joined Jani Stefanovic's band Essence of Sorrow with Mats Leven (Vocals), Christian Palin (singer for Random Eyes on vocals). In January 2007, they released their first album, Reflections From The Obscure.[citation needed]