Timo Kotipelto
Aside from Stratovarius and Kotipelto, Timo Kotipelto has also provided additional vocals to Sonata Arctica's Silence album along with lead vocals with his close friend, ex-Sonata Arctica guitarist Jani Liimatainen and his band Cain's Offering. and lead vocals for the song "Out of the White Hole", on Ayreon's 2000 release .