There are at least ten 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

(2) Black metal from Norway, with members of Carpathian Forest and Nattefrost. They released a demo in 1993 called 'Nordisk vinter'.

(3) A rapper from Houston, TX. He is a part of the SPC (South Park Coalition) and was at one time signed to Dope House Records.

(4) A visual kei band from Japan. They released three singles.

(5) An ambient project which released one album in 2006. Soundsources: vinyl noise and guitar.

(6) A Dutch Dubstep DJ.

(7) A Finnish black metal band from Kuusamo who released one demo "Soulraper" in 1998.

(8) A Industrial Metal band from Hamburg, Germany. Their official site is at : www.myspace.com/grimmtunes

(9) An Australian based trap/electronic producer.

(10) A German hard rock / grunge band from Kiel (http://grimm-band.de/). Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.