There are seven artists under the name of Grimm: (1) Avant garde occult folkloremetal from The Netherlands. They released two full length albums: 'Dark medieval folklore', and "Heksenkringen", (april 2007). Various members play in bands like Zwartketterij, Walpurgisnacht and Gauhaert. The "Grimm" refers to an occult group of dutch pagan druids who were persecuted and executed during the Spanish Inquisition.
http://www.myspace.com/heksenkringen and www.heksenkringen.nl