Jari Mäenpää is a Finnish heavy metal multi-instrumentalist and songwriter. He is the founder of Wintersun for which he records all instruments except the drums. Before forming Wintersun, Mäenpää was best known for his role in the folk metal band Ensiferum, which he joined in 1996 after leaving his prior band named Immemorial. Wintersun was initially planned as a parallel project alongside Ensiferum, but in January, 2004 he was forced to leave Ensiferum due to clashes between their touring schedule and the studio recording time he had booked for Wintersun.
Karl Fredrik Henrik Åkesson is a Swedish heavy metal guitarist. He is a current member of Opeth and is also active in Krux, Monsters of Metal, and Talisman.
Alexi Laiho was a Finnish guitarist, composer, and vocalist. He was best known as the lead guitarist, lead vocalist and founding member of the melodic death metal band Children of Bodom, and was also the guitarist for Sinergy, The Local Band, Kylähullut, and Bodom After Midnight, which formed just prior to his death. Laiho had previously played with Thy Serpent and Impaled Nazarene on occasion, as well as Warmen and Hypocrisy.
Björn Gelotte is a Swedish musician and songwriter, best known as the lead guitarist for metal band In Flames. He originally joined the band as the drummer in 1995, and continued in this position during The Jester Race (1996) and Whoracle (1997). He switched to his current position on lead guitar after Glenn Ljungström left the band, sharing lead/rhythm guitar work with former In Flames guitarist Jesper Strömblad.