Korpiklaani (芬蘭)

Korpiklaani (Finnish: Wilderness Clan) is a folk metal band from Finland.
Their music consists of metal with a happy folky base. So does their choice of instruments, they use a mixture of electric guitars and drums as well as violin, woodwinds, jouhikko, djembé, and the typical Finnish folk instrument: the accordion. They reject synthesizers (of course), and use only genuine instruments.

http://www.korpiklaani.com/