Marko "Marco" Tapani Hietala (born January 14, 1966 in Tervo, Finland) is the male vocalist, bassist and songwriter of the Finnish heavy metal band Tarot and bassist and the male vocalist of the Finnish symphonic metal band Nightwish. He joined the band for their 2002 album Century Child, following the departure of previous bassist Sami Vänskä. He was a prominent guest musician in Delain, a project involving many members of the gothic/symphonic metal community. He is the bassist and lends his voice to a number of songs. He also participated in the recording of Invitation, by Altaria, providing backing vocals. Hietala has also been part of the bands Sinergy and Northern Kings. Since his arrival to Nightwish, several songs have been written to contain duets with the former Nightwish vocalist Tarja Turunen, allowing songwriter and band leader Tuomas Holopainen to take full advantage of Hietala's cool raucous voice to add a new dimension to

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