Marko Tapani “Marco” Hietala (born 14 January 1966) is a Finnish heavy metal vocalist, bassist and songwriter. Internationally, he is most known as the current bassist, male vocalist and secondary composer to Tuomas Holopainen, of the symphonic metal band Nightwish. He is also the vocalist and bassist as well as composer and lyricist for the heavy metal band Tarot. He also sings in the Raskasta Joulua (heavy christmas) project